Entry 266

Innis, Mutation's first boss, and the bosses by code

2026-09-28battletestvolumes

Filescrates/piney-battle/src/boss/innis.rscrates/piney-battle/src/boss.rscrates/piney-world/src/combat/boss.rscrates/piney-world/src/bosscam.rscrates/piney-world/src/field_world.rscrates/piney-gen/src/manifest.rstools/test_battle_innis_rs.pydocs/engine/boss-innis.md

Innis (ccBoss02, its three ccBoss02Slave images and their BreakMirrors) is ported from MUT gcmn (0x004941b0-0x0049da1c, 0x00533d90-0x00534a7c), with Infection's DWARF for the names and layouts. Its missiles' Draws (MUT 0x00478d50, 0x00479930, 0x0047a220) are ported as rules too, because the first one calls MagicDamage. The reference is docs/engine/boss-innis.md.

The bosses by code

ccBossEntryStart(code) starts bossFunc[code] (MUT 0x006192c0). The field made Skeith for any entry 7. Now FieldWorld::start_boss(code) takes the entry's code: 0 Skeith, 1 Innis, and nothing for the others. Boss.class (Class::Skeith, Class::Innis) picks the Main, and the area host reports eventMng.bossEntry as that code. Each boss's tables come from the build: innis_pattern, innis_epitaph, innis_anims, innis_various_skills, innis_downer_skills, innis_monster_anims, innis_ring_models and cinema_skill_names join the combat group (DATA_VERSION 10). The cinema's names are no longer Skeith's one row: _g_cinemaSkillName gives Innis rows 5-8 and 70 (x21's TEX_ini_skl).

What had to be found

• DmgCount starts at 0, not maxHP: the constructor reads maxHP before SetBaseParam. The first DmgCheckCount therefore sees no damage.
• SwitchActionPattern's jump table (MUT 0x006e0c20) is not in word order: 2 is Pattern06, 3 Pattern02, 8 and 9 Pattern05, 10 Pattern11, 13 Pattern08.
• SelectTarget's type 14 never picks; RndTarget draws 0-14.
• Act 5 writes ccMenu.forbid itself, and Main's reserved-forbid check in the same frame reads that write.
• SkillAttack passes SetFreeCamPosView a view whose x and y are an uninitialised stack slot. It holds SetCameraEyes' saved $ra (0x00496fe4), which the FPU reads as zero.
• BreakMirror::Mbreak never resets its matrix between shards, so the shards' turns accumulate. MainMirror calls SetData again when done, another 300 ccRand and 60 rand().
• Mutation's ccBossCam moved its fields. +0xe0 is the pitch SkillAttack raises, and CheckMoveCamera reads +0xec. SetMode 5 and 6 and SetFreeCamPosView are ported into BossCam.

Checks

tools/test_battle_innis_rs.py (PINEY_VOLUME=mutation) runs Mutation's own ccBoss02 constructor and Main in eemu against battle_probe's innis request. It compares every frame over random cases. Its two tests (test_effect_lives, six cases 7100-7105) pass. bulk 120 9100 matched all 120 cases, 228,066 frames. The acts reached were 0-6, 12, 13 and 14. One bulk failure was the harness's: it did not reset its shard count before the constructor. Skeith's harness (bulk 40), test_bosscam_rs.py, test_boss_effect_rs.py and test_cinema_rs.py still pass.

The Rust tests are in boss::innis::tests: stands_behind_kite_and_waits_first, drained_to_the_epitaph_then_dies_and_exits, the_magic_lands_and_lets_the_party_go and the_images_break_and_come_back. The session tests event_107_ends_with_innis and innis_drained_through_the_menus are in session/tests/skeith.rs (session.rs, which declares the test modules, was not mine to edit). They could not be built here: the tree's piney-stream did not compile at the time (opening_events, work in progress elsewhere).

Event 107 under the autopilot

PINEY_SURVEY_ONLY=107 PINEY_SURVEY_GOD=1 PINEY_SURVEY_FRAMES=150000 ends with story 107: blocks 0xff89b; 4321 places; last: The World - area 1 field 2. That is block 17 played (Innis made) and block 20 not. The fight runs: Innis's HP falls and its protect breaks several times, with windows of about 300 frames. The pilot tries Data Drain at each break, but menu 65 finds no target and shows its warning. Kite stands near (-154, 402) casting while Innis roams. At the first break Innis was 2515 away, past Data Drain's reach (triggerRange 2000 plus the width). For most of its actions Innis is also off the command list (EntryFlg, as the game does it). Skeith came to Kite; Innis does not, and the pilot does not walk to it. The autopilot was left alone as asked.