---
description: Add a new boss as data, following the existing format
argument-hint: <boss name and the idea behind each phase>
---

Add a boss: $ARGUMENTS

Do it as data, not code:

1. Read `src/content/content.gd` — the Warden is the reference. Its phases layer
   one idea at a time, which is the design intent, not an accident.
2. Add a `static func` returning a `BossDef`, built from the emitters in
   `src/sim/patterns/`. Register the id in `Content.boss()` and add a
   `BOSS_*` constant.
3. Give every phase a `telegraph_ticks` window so the transition is readable.
4. Add tests to `tests/unit/test_boss.gd`: phase thresholds, and that the
   pattern actually fills the arena.
5. Run `tools/check.sh` then `tools/test.sh`.

If you find yourself wanting to add a branch to `SimWorld` for this boss, stop
and add a new `BulletEmitter` subclass instead — the format is supposed to
absorb the difference.