diff --git a/docs/DECISIONS.md b/docs/DECISIONS.md
index c6cd7ca..fb7fabc 100644
--- a/docs/DECISIONS.md
+++ b/docs/DECISIONS.md
@@ -340,3 +340,25 @@ pins the clamp.
 reliable channel, and the client learns enemy health from the snapshot anyway.
 Death is still announced, because the experience award is keyed on that event
 and a kill by poison has to score.
+
+---
+
+## The scale of the numbers
+
+**Health and damage are ten times what they started as, and every ratio is
+unchanged.** A shot is 60, a fresh character has 1000, the Warden has 36000,
+and enemy health and emitter damage were scaled with them — time to kill is
+exactly what it was.
+
+The reason is rounding, not balance. Damage is an integer, and at a base of 6
+the +5% that every upgrade carries computed to 6.3 and rounded back to 6: a
+player took their first upgrade, was told it made them stronger, and it did
+nothing. Ten times the base means every 5% step is worth 3 damage. The same
+applies to the boss's per-phase armour multiplier, which at 6 damage rounded
+1.15 into 1.17.
+
+**The practice dummy is indestructible by flag, not by a large number.** The
+old 100000 health was already past the u16 the snapshot sends enemy health in,
+and once a shot did 60 a patient player could have worn it down and left the
+hub without a practice target until the next restart. A flag says what was
+actually meant.
diff --git a/docs/ROADMAP.md b/docs/ROADMAP.md
index 96eb8b0..c1e7d6f 100644
--- a/docs/ROADMAP.md
+++ b/docs/ROADMAP.md
@@ -20,7 +20,7 @@ What "everything passes" currently means. Numbers move; the shape does not.
 | Gate | Covers | Runtime |
 | --- | --- | --- |
 | `tools/check.sh` | every script parses and type-checks | ~5s |
-| `tools/test.sh` | 357 GUT tests, no SceneTree | ~4s |
+| `tools/test.sh` | 364 GUT tests, no SceneTree | ~4s |
 | `tools/smoke.sh` | 18 assertions over a real ENet socket: handshake, auth, character creation and persistence, both dungeon kinds, escape, hard kill, polite disconnect | ~40s |
 | `diag_prediction.tscn` | client-prediction gap, with injected clock drift | ~10s |
 | `diag_progression.tscn` | kill → xp → level → health, death → retire → roster, swap guards | ~10s |
@@ -219,6 +219,29 @@ shares the interact key.
 
 ---
 
+## The scale of health and damage
+
+Health and damage are an order of magnitude larger than they started. A shot is
+60, a fresh character has 1000, the Warden has 36000. **Every ratio is
+unchanged** — enemy health, boss health and every emitter's damage were scaled
+together, so time to kill is exactly what it was.
+
+The reason is rounding. At the old base of 6 damage, the +5% every upgrade
+carries computed to 6.3 and rounded straight back to 6, so a player's first
+upgrade visibly did nothing. At 60 it is +3, and every percentage in the game
+now has somewhere to land.
+
+`tests/unit/test_content.gd` pins both halves of that: that a single upgrade
+changes damage, and that shots-to-kill for each enemy is what it was before.
+Do not tidy these numbers back down without scaling `content.gd` with them.
+
+The hub's practice dummy stopped relying on a huge health pool at the same
+time: it is `indestructible` by flag now. The old 100000 was already past the
+u16 the snapshot sends enemy health in, and after the rescale a patient player
+could have destroyed the hub's only practice target for everyone.
+
+---
+
 ## Stage 4 — Upgrades · *done*
 
 Every level gained banks one choice. Choices are spent at the **quartermaster**,
@@ -284,9 +307,6 @@ All four settled with the user; the reasoning is in
 
 ### Known gaps
 
-- **The +5% is invisible on the first upgrade.** `PLAYER_BULLET_DAMAGE` is 6, so
-  6 × 1.05 rounds back to 6. It accumulates correctly (14 upgrades → +70% → 10
-  damage), but the first one visibly does nothing. See the open question below.
 - **One panel, not two screens.** The brief asked for a separate screen listing
   upgrades taken; it is the lower half of the choice panel instead, because the
   two are read together.
@@ -337,19 +357,6 @@ Not oversights — each was considered and rejected for now, with the reasoning
 Genuinely unspecified. **Do not guess at these** — each changes the design, and
 several have no obvious default.
 
-### Worth a decision soon
-
-1. **Base damage is too small for the +5% to show.** `PLAYER_BULLET_DAMAGE` is
-   6, and 6 × 1.05 rounds to 6 — so the flat bonus every upgrade carries does
-   nothing at all until the second one. It comes out right in aggregate, but a
-   player who takes Split Shot and sees no damage change has been told
-   something untrue.
-
-   The clean fix is to scale base damage and enemy health together — ×4 would
-   put a shot at 24 and make every 5% step land — which changes no time-to-kill
-   but touches every number in `content.gd`. That is a balance edit, so it is
-   yours to call rather than mine.
-
 ### Blocking nothing yet
 
 8. **What advances dungeon depth?** `--depth` is a dev flag; nothing raises it
diff --git a/resources/bosses/warden.tres b/resources/bosses/warden.tres
index ac370de..e46b59a 100644
--- a/resources/bosses/warden.tres
+++ b/resources/bosses/warden.tres
@@ -27,7 +27,7 @@ interval = 45
 speed = 135.0
 radius = 8.0
 lifetime = 420
-damage = 14
+damage = 140
 
 [sub_resource type="Resource" id="Resource_a0mrn"]
 script = ExtResource("5_v02no")
@@ -37,6 +37,7 @@ start_tick = 120
 interval = 150
 speed = 210.0
 radius = 6.0
+damage = 120
 kind = 2
 
 [sub_resource type="Resource" id="Resource_pfjxl"]
@@ -54,6 +55,7 @@ muzzle_offset = 46.0
 interval = 9
 speed = 120.0
 lifetime = 480
+damage = 120
 
 [sub_resource type="Resource" id="Resource_k1e8f"]
 script = ExtResource("6_x6ufy")
@@ -63,7 +65,7 @@ start_tick = 90
 interval = 170
 speed = 175.0
 radius = 8.0
-damage = 16
+damage = 160
 kind = 3
 
 [sub_resource type="Resource" id="Resource_4sp1g"]
@@ -83,7 +85,7 @@ sweep_period = 5.0
 interval = 5
 speed = 165.0
 lifetime = 400
-damage = 13
+damage = 130
 
 [sub_resource type="Resource" id="Resource_3fm5w"]
 script = ExtResource("5_v02no")
@@ -95,6 +97,7 @@ start_tick = 60
 interval = 110
 speed = 195.0
 radius = 6.0
+damage = 120
 kind = 2
 
 [sub_resource type="Resource" id="Resource_20c8f"]
@@ -106,6 +109,7 @@ end_tick = 600
 interval = 60
 speed = 105.0
 lifetime = 420
+damage = 120
 
 [sub_resource type="Resource" id="Resource_ymr56"]
 script = ExtResource("2_f5abt")
@@ -124,7 +128,7 @@ interval = 11
 speed = 130.0
 turn_deg = 0.55
 lifetime = 400
-damage = 15
+damage = 150
 
 [sub_resource type="Resource" id="Resource_3n6oq"]
 script = ExtResource("6_x6ufy")
@@ -134,7 +138,7 @@ start_tick = 40
 interval = 130
 speed = 200.0
 radius = 8.0
-damage = 18
+damage = 180
 kind = 3
 
 [sub_resource type="Resource" id="Resource_8ppic"]
@@ -145,7 +149,7 @@ start_tick = 100
 interval = 80
 speed = 300.0
 radius = 5.0
-damage = 16
+damage = 160
 kind = 2
 
 [sub_resource type="Resource" id="Resource_yqxmm"]
@@ -161,7 +165,7 @@ emitters = Array[ExtResource("3_tmo3e")]([SubResource("Resource_7xac7"), SubReso
 script = ExtResource("8_axg03")
 id = &"warden"
 display_name = "Warden of the Fold"
-max_hp = 3600
+max_hp = 36000
 radius = 42.0
 spawn_pos = Vector2(0, -150)
 phases = Array[ExtResource("2_f5abt")]([SubResource("Resource_pfjxl"), SubResource("Resource_4sp1g"), SubResource("Resource_ymr56"), SubResource("Resource_yqxmm")])
diff --git a/resources/enemies/drifter.tres b/resources/enemies/drifter.tres
index 76bcb46..5dc1096 100644
--- a/resources/enemies/drifter.tres
+++ b/resources/enemies/drifter.tres
@@ -12,7 +12,7 @@ spread_deg = 20.0
 interval = 120
 radius = 6.0
 lifetime = 240
-damage = 10
+damage = 100
 
 [sub_resource type="Resource" id="Resource_lnbnj"]
 script = ExtResource("3_vpd04")
@@ -23,6 +23,7 @@ chance = 0.08
 script = ExtResource("4_k36hi")
 id = &"drifter"
 display_name = "Drifter"
+max_hp = 400
 speed = 55.0
 emitters = Array[ExtResource("1_bjhtk")]([SubResource("Resource_rsrg2")])
 pattern_loop_ticks = 120
diff --git a/resources/enemies/dummy.tres b/resources/enemies/dummy.tres
index 20de167..4dd97a6 100644
--- a/resources/enemies/dummy.tres
+++ b/resources/enemies/dummy.tres
@@ -8,7 +8,8 @@
 script = ExtResource("3_2tv1l")
 id = &"dummy"
 display_name = "Target Dummy"
-max_hp = 100000
+max_hp = 1000
 radius = 20.0
 move = 0
 visual = 3
+indestructible = true
diff --git a/resources/enemies/stalker.tres b/resources/enemies/stalker.tres
index 3f93463..08fc6dc 100644
--- a/resources/enemies/stalker.tres
+++ b/resources/enemies/stalker.tres
@@ -13,7 +13,7 @@ interval = 45
 speed = 260.0
 radius = 6.0
 lifetime = 18
-damage = 14
+damage = 140
 kind = 3
 
 [sub_resource type="Resource" id="Resource_ep81w"]
@@ -25,7 +25,7 @@ chance = 0.08
 script = ExtResource("4_yp71e")
 id = &"stalker"
 display_name = "Stalker"
-max_hp = 30
+max_hp = 300
 radius = 12.0
 move = 3
 speed = 95.0
diff --git a/resources/enemies/turret.tres b/resources/enemies/turret.tres
index 76a86d5..f67b032 100644
--- a/resources/enemies/turret.tres
+++ b/resources/enemies/turret.tres
@@ -11,6 +11,7 @@ count = 10
 spin_per_shot_deg = 18.0
 interval = 150
 speed = 130.0
+damage = 120
 
 [sub_resource type="Resource" id="Resource_fttpl"]
 script = ExtResource("3_hc01i")
@@ -21,7 +22,7 @@ chance = 0.08
 script = ExtResource("4_6rb75")
 id = &"turret"
 display_name = "Turret"
-max_hp = 70
+max_hp = 700
 radius = 16.0
 move = 0
 speed = 0.0
diff --git a/src/actors/enemies/enemy_def.gd b/src/actors/enemies/enemy_def.gd
index 2abf368..b47e242 100644
--- a/src/actors/enemies/enemy_def.gd
+++ b/src/actors/enemies/enemy_def.gd
@@ -36,6 +36,11 @@ enum Move {
 @export var emitters: Array[BulletEmitter] = []
 ## The emitter timeline wraps at this many ticks.
 @export var pattern_loop_ticks: int = 240
+## Never takes damage. Exists for the hub's practice target, whose whole job is
+## to still be there tomorrow -- expressing that as a flag rather than as a
+## large health pool means it cannot be worn down by a patient player, and
+## keeps its health inside the u16 the snapshot sends.
+@export var indestructible: bool = false
 ## What this enemy may leave behind. Rolled once per entry on death, against
 ## the world's own RNG. Empty for anything that should drop nothing.
 @export var loot: Array[LootDrop] = []
diff --git a/src/content/content.gd b/src/content/content.gd
index d285a6a..b2d19fc 100644
--- a/src/content/content.gd
+++ b/src/content/content.gd
@@ -43,7 +43,7 @@ static func drifter() -> EnemyDef:
 	var d := EnemyDef.new()
 	d.id = ENEMY_DRIFTER
 	d.display_name = "Drifter"
-	d.max_hp = 40
+	d.max_hp = 400
 	d.radius = 14.0
 	d.move = EnemyDef.Move.DRIFT
 	d.speed = 55.0
@@ -57,7 +57,7 @@ static func drifter() -> EnemyDef:
 	fan.spread_deg = 20.0
 	fan.speed = 150.0
 	fan.radius = 6.0
-	fan.damage = 10
+	fan.damage = 100
 	fan.lifetime = 240
 	fan.kind = SimConfig.KIND_ORB
 	d.emitters = [fan]
@@ -70,7 +70,7 @@ static func turret() -> EnemyDef:
 	var d := EnemyDef.new()
 	d.id = ENEMY_TURRET
 	d.display_name = "Turret"
-	d.max_hp = 70
+	d.max_hp = 700
 	d.radius = 16.0
 	d.move = EnemyDef.Move.STATIC
 	d.speed = 0.0
@@ -84,7 +84,7 @@ static func turret() -> EnemyDef:
 	ring.spin_per_shot_deg = 18.0
 	ring.speed = 130.0
 	ring.radius = 7.0
-	ring.damage = 12
+	ring.damage = 120
 	ring.lifetime = 300
 	ring.kind = SimConfig.KIND_ORB
 	d.emitters = [ring]
@@ -104,7 +104,7 @@ static func stalker() -> EnemyDef:
 	var d := EnemyDef.new()
 	d.id = ENEMY_STALKER
 	d.display_name = "Stalker"
-	d.max_hp = 30
+	d.max_hp = 300
 	d.radius = 12.0
 	d.move = EnemyDef.Move.APPROACH
 	d.speed = 95.0
@@ -119,7 +119,7 @@ static func stalker() -> EnemyDef:
 	lunge.spread_deg = 62.0
 	lunge.speed = 260.0
 	lunge.radius = 6.0
-	lunge.damage = 14
+	lunge.damage = 140
 	# 18 ticks at 260 u/s is about 78px of reach -- shorter than the muzzle-to-
 	# player distance at any range you would call "not point blank".
 	lunge.lifetime = 18
@@ -130,12 +130,18 @@ static func stalker() -> EnemyDef:
 	return d
 
 
-## Lobby target dummy: inert, tough, so players can feel out the gun.
+## Lobby target dummy: inert, indestructible, so players can feel out the gun.
+##
+## Indestructible by flag rather than by a huge health pool. The old 100000 was
+## already past the u16 the snapshot sends enemy health in, and after the x10
+## rescale a determined player could have destroyed the hub's only practice
+## target for everyone until the server restarted.
 static func dummy() -> EnemyDef:
 	var d := EnemyDef.new()
 	d.id = ENEMY_DUMMY
 	d.display_name = "Target Dummy"
-	d.max_hp = 100000
+	d.max_hp = 1000
+	d.indestructible = true
 	d.radius = 20.0
 	d.move = EnemyDef.Move.STATIC
 	d.visual = 3
@@ -151,7 +157,7 @@ static func warden() -> BossDef:
 	var b := BossDef.new()
 	b.id = BOSS_WARDEN
 	b.display_name = "Warden of the Fold"
-	b.max_hp = 3600
+	b.max_hp = 36000
 	b.radius = 42.0
 	b.stationary = true
 	b.spawn_pos = Vector2(0.0, -150.0)
@@ -182,7 +188,7 @@ static func _warden_p1() -> BossPhase:
 	ring.spin_per_shot_deg = 9.0
 	ring.speed = 135.0
 	ring.radius = 8.0
-	ring.damage = 14
+	ring.damage = 140
 	ring.lifetime = 420
 	ring.muzzle_offset = 46.0
 
@@ -193,7 +199,7 @@ static func _warden_p1() -> BossPhase:
 	fan.spread_deg = 26.0
 	fan.speed = 210.0
 	fan.radius = 6.0
-	fan.damage = 12
+	fan.damage = 120
 	fan.kind = SimConfig.KIND_NEEDLE
 	fan.muzzle_offset = 46.0
 
@@ -216,7 +222,7 @@ static func _warden_p2() -> BossPhase:
 	spiral.spin_per_shot_deg = 23.0
 	spiral.speed = 120.0
 	spiral.radius = 7.0
-	spiral.damage = 12
+	spiral.damage = 120
 	spiral.lifetime = 480
 	spiral.muzzle_offset = 46.0
 
@@ -229,7 +235,7 @@ static func _warden_p2() -> BossPhase:
 	wall.gap_step = 7
 	wall.speed = 175.0
 	wall.radius = 8.0
-	wall.damage = 16
+	wall.damage = 160
 	wall.lifetime = 300
 	wall.kind = SimConfig.KIND_HEAVY
 
@@ -256,7 +262,7 @@ static func _warden_p3() -> BossPhase:
 	arms.sweep_period = 5.0
 	arms.speed = 165.0
 	arms.radius = 7.0
-	arms.damage = 13
+	arms.damage = 130
 	arms.lifetime = 400
 
 	var fan := AimedSpreadEmitter.new()
@@ -268,7 +274,7 @@ static func _warden_p3() -> BossPhase:
 	fan.speed = 195.0
 	fan.edge_speed_bonus = 0.25
 	fan.radius = 6.0
-	fan.damage = 12
+	fan.damage = 120
 	fan.kind = SimConfig.KIND_NEEDLE
 
 	var counter_ring := RingEmitter.new()
@@ -279,7 +285,7 @@ static func _warden_p3() -> BossPhase:
 	counter_ring.spin_per_shot_deg = -14.0
 	counter_ring.speed = 105.0
 	counter_ring.radius = 7.0
-	counter_ring.damage = 12
+	counter_ring.damage = 120
 	counter_ring.lifetime = 420
 
 	p.emitters = [arms, fan, counter_ring]
@@ -303,7 +309,7 @@ static func _warden_p4() -> BossPhase:
 	curve.speed = 130.0
 	curve.turn_deg = 0.55
 	curve.radius = 7.0
-	curve.damage = 15
+	curve.damage = 150
 	curve.lifetime = 400
 	curve.muzzle_offset = 46.0
 
@@ -316,7 +322,7 @@ static func _warden_p4() -> BossPhase:
 	walls.gap_step = 5
 	walls.speed = 200.0
 	walls.radius = 8.0
-	walls.damage = 18
+	walls.damage = 180
 	walls.kind = SimConfig.KIND_HEAVY
 
 	var snipe := AimedSpreadEmitter.new()
@@ -326,7 +332,7 @@ static func _warden_p4() -> BossPhase:
 	snipe.spread_deg = 10.0
 	snipe.speed = 300.0
 	snipe.radius = 5.0
-	snipe.damage = 16
+	snipe.damage = 160
 	snipe.kind = SimConfig.KIND_NEEDLE
 
 	p.emitters = [curve, walls, snipe]
diff --git a/src/core/sim_config.gd b/src/core/sim_config.gd
index 47557f5..25257f0 100644
--- a/src/core/sim_config.gd
+++ b/src/core/sim_config.gd
@@ -35,12 +35,19 @@ const PLAYER_VISUAL_RADIUS := 13.0
 ## the ship -- and on a remote client, the ship is also drawn a tick or two
 ## ahead of the server, so this margin is what absorbs that too.
 const PLAYER_MUZZLE_OFFSET := PLAYER_VISUAL_RADIUS + 6.0
-const PLAYER_MAX_HP := 100
+## Health and damage are deliberately an order of magnitude larger than the
+## numbers they started as. Every ratio in the game is unchanged -- enemy
+## health, boss health and every emitter's damage were scaled with them -- but
+## percentages now have somewhere to land. At the old base of 6 damage, the +5%
+## that every upgrade carries computed to 6.3 and rounded straight back to 6,
+## so a player's first upgrade visibly did nothing at all. At 60 it is +3.
+## Do not "tidy" these back down without scaling content.gd with them.
+const PLAYER_MAX_HP := 1000
 const PLAYER_FIRE_COOLDOWN := 14         # ticks (~4.3 shots/sec)
 const PLAYER_BULLET_SPEED := 620.0
 const PLAYER_BULLET_RADIUS := 4.0
 const PLAYER_BULLET_LIFETIME := 90       # ticks
-const PLAYER_BULLET_DAMAGE := 6
+const PLAYER_BULLET_DAMAGE := 60
 ## There are deliberately NO invulnerability frames after a hit. In a bullet
 ## hell the wall of bullets IS the threat, and i-frames turn a dense pattern
 ## into a single cheap hit -- you get punished for the first bullet and gifted
diff --git a/src/meta/progression.gd b/src/meta/progression.gd
index 64b57bd..b593ada 100644
--- a/src/meta/progression.gd
+++ b/src/meta/progression.gd
@@ -10,8 +10,9 @@ extends RefCounted
 const MAX_LEVEL := 15
 const START_LEVEL := 1
 ## Hit points added per level gained. Level 1 is SimConfig.PLAYER_MAX_HP, so a
-## capped character has PLAYER_MAX_HP + 14 * this.
-const HP_PER_LEVEL := 10
+## capped character has PLAYER_MAX_HP + 14 * this. Scaled with everything else
+## -- see the note on SimConfig.PLAYER_MAX_HP.
+const HP_PER_LEVEL := 100
 
 ## Experience for the first level-up. The curve is tuned so one full clear of a
 ## depth-1 dungeon lands a little past this -- the first run should end with a
diff --git a/src/sim/sim_world.gd b/src/sim/sim_world.gd
index 8b392c1..3d9099b 100644
--- a/src/sim/sim_world.gd
+++ b/src/sim/sim_world.gd
@@ -746,6 +746,8 @@ func _damage_player(p: SimPlayer, amount: int) -> void:
 ## from the snapshot anyway. Death is still announced either way, because that
 ## is what the experience award is keyed on.
 func _damage_enemy(e: SimEnemy, amount: int, silent: bool = false) -> void:
+	if e.def.indestructible:
+		return
 	e.hp = maxi(e.hp - amount, 0)
 	if not silent:
 		events.append({"t": SimEvent.Type.ENEMY_HIT, "id": e.id, "dmg": amount, "hp": e.hp})
diff --git a/tests/unit/test_content.gd b/tests/unit/test_content.gd
index b498bf5..c0a5a6f 100644
--- a/tests/unit/test_content.gd
+++ b/tests/unit/test_content.gd
@@ -76,3 +76,75 @@ func test_enemy_bullets_from_the_stalker_do_not_litter_the_arena() -> void:
 		world.step()
 	assert_lt(world.pool.live_count, 12,
 		"a short lifetime should keep spent point-blank shots from accumulating")
+
+
+# --- The scale of the numbers -----------------------------------------------
+
+## Health and damage were multiplied by ten so that percentage modifiers have
+## somewhere to land: at the old base of 6 damage, the +5% every upgrade carries
+## rounded straight back to 6 and a player's first upgrade did nothing visible.
+## These tests pin the properties that made the rescale worth doing, and the
+## ratios it had to leave alone.
+func test_a_single_upgrade_visibly_changes_damage() -> void:
+	var none := PlayerStats.build([] as Array[StringName])
+	for id in Upgrades.ORDER:
+		var one := PlayerStats.build([id] as Array[StringName])
+		assert_ne(one.damage, none.damage,
+			"%s carries +%d%% damage and must not round away" % [
+				id, roundi(SimConfig.UPGRADE_DAMAGE_BONUS * 100.0)])
+
+
+## Time to kill is the balance-relevant number, and the rescale was explicitly
+## not allowed to change it. Written as shots rather than as a ratio so a
+## careless edit to either side shows up as a number a designer recognises.
+func test_shots_to_kill_is_what_it_was_before_the_rescale() -> void:
+	var expected := {
+		Content.ENEMY_DRIFTER: 7,   # 400 hp / 60
+		Content.ENEMY_TURRET: 12,   # 700 hp / 60
+		Content.ENEMY_STALKER: 5,   # 300 hp / 60
+	}
+	for id in expected:
+		var def := Content.enemy(id)
+		var shots := ceili(float(def.max_hp) / float(SimConfig.PLAYER_BULLET_DAMAGE))
+		assert_eq(shots, int(expected[id]), "%s takes %d shots" % [id, shots])
+
+
+## Likewise for how long an unarmoured player survives standing in the open.
+func test_hits_to_kill_a_player_is_what_it_was() -> void:
+	var base := SimConfig.PLAYER_MAX_HP
+	var worst := 0
+	for id in HOSTILES:
+		for e in Content.enemy(id).emitters:
+			worst = maxi(worst, e.damage)
+	assert_eq(worst, 140, "the stalker's point-blank pellet is still the hardest hit")
+	assert_eq(base / worst, 7, "and still takes this many to drop a fresh character")
+
+
+## Enemy health rides the snapshot as a u16. Anything above that is silently
+## misreported rather than rejected, which is exactly the kind of bug that
+## survives a rescale unnoticed -- the old practice dummy was already past it.
+func test_every_enemy_fits_the_health_field_the_wire_gives_it() -> void:
+	for id in [Content.ENEMY_DRIFTER, Content.ENEMY_TURRET,
+			Content.ENEMY_STALKER, Content.ENEMY_DUMMY]:
+		assert_lte(Content.enemy(id).max_hp, 65535, "%s is too big for the wire" % id)
+
+
+## A levelled character's health rides the same kind of field.
+func test_a_capped_character_fits_the_health_field_too() -> void:
+	assert_lte(Progression.max_hp_for_level(Progression.MAX_LEVEL), 65535)
+
+
+## The hub's practice target has to still be there tomorrow. Expressed as a
+## flag, so a patient player cannot wear it down and leave the hub without one.
+func test_the_practice_dummy_cannot_be_destroyed() -> void:
+	var world := SimWorld.new(1)
+	var e := world.spawn_enemy(Content.dummy(), Vector2(200.0, 0.0))
+	world._damage_enemy(e, 10_000_000)
+	assert_true(e.alive)
+	assert_eq(e.hp, e.def.max_hp, "and takes no damage at all")
+
+
+func test_nothing_else_is_indestructible() -> void:
+	for id in HOSTILES:
+		assert_false(Content.enemy(id).indestructible,
+			"%s must be killable, or it is scenery" % id)
diff --git a/tests/unit/test_regen.gd b/tests/unit/test_regen.gd
index e202487..5b8c01a 100644
--- a/tests/unit/test_regen.gd
+++ b/tests/unit/test_regen.gd
@@ -39,7 +39,9 @@ func test_fractions_accumulate_rather_than_being_lost() -> void:
 
 func test_it_scales_with_maximum_health_so_levels_do_not_dilute_it() -> void:
 	var low := _player()
-	low.max_hp = 100
+	# Taken from the curve rather than written down, so a rescale of the health
+	# numbers cannot leave this test comparing two arbitrary constants.
+	low.max_hp = Progression.max_hp_for_level(Progression.START_LEVEL)
 	low.hp = 1
 	for _i in SimConfig.TICK_RATE:
 		world.step()
@@ -47,7 +49,7 @@ func test_it_scales_with_maximum_health_so_levels_do_not_dilute_it() -> void:
 
 	var world2 := SimWorld.new(1)
 	var high := world2.add_player(PEER, "tester")
-	high.max_hp = 240
+	high.max_hp = Progression.max_hp_for_level(Progression.MAX_LEVEL)
 	high.hp = 1
 	for _i in SimConfig.TICK_RATE:
 		world2.step()