diff --git a/src/boss.asm b/src/boss.asm
index 3474084..bbf4e84 100644
--- a/src/boss.asm
+++ b/src/boss.asm
@@ -17,6 +17,7 @@
 ;;; with Annalog.  If not, see <http://www.gnu.org/licenses/>.              ;;;
 ;;;=========================================================================;;;
 
+.INCLUDE "actor.inc"
 .INCLUDE "audio.inc"
 .INCLUDE "boss.inc"
 .INCLUDE "device.inc"
@@ -34,7 +35,9 @@
 .IMPORT Func_DivMod
 .IMPORT Func_FindEmptyActorSlot
 .IMPORT Func_GetRandomByte
+.IMPORT Func_InitActorDefault
 .IMPORT Func_InitActorSmokeExplosion
+.IMPORT Func_InitActorSmokeParticle
 .IMPORT Func_IsFlagSet
 .IMPORT Func_LockDoorDevice
 .IMPORT Func_MarkRoomSafe
@@ -47,6 +50,7 @@
 .IMPORT Func_SetMachineIndex
 .IMPORT Func_ShakeRoom
 .IMPORT Func_UnlockDoorDevice
+.IMPORT Ram_ActorType_eActor_arr
 .IMPORT Ram_DeviceAnim_u8_arr
 .IMPORT Ram_DeviceTarget_byte_arr
 .IMPORT Ram_DeviceType_eDevice_arr
@@ -222,6 +226,7 @@ _BossBattle:
     jsr Func_SetFlag
     jsr Func_MarkRoomSafe
     jsr FuncA_Room_DisableAllMachinesAndConsoles
+    jsr FuncA_Room_ExpireAllBossProjectiles
     ;; Turn off the boss music.
     lda #eMusic::Silence
     sta Zp_Next_sAudioCtrl + sAudioCtrl::Music_eMusic
@@ -441,6 +446,47 @@ _DisableConsoles:
     rts
 .ENDPROC
 
+;;; Expires all boss-fired projectiles, either turning them to smoke or just
+;;; removing them.
+.PROC FuncA_Room_ExpireAllBossProjectiles
+    ldx #kMaxActors - 1
+_Loop:
+    jsr _MaybeExpireActor  ; preserves X
+    dex
+    .assert kMaxActors <= $80, error
+    bpl _Loop
+    rts
+_MaybeExpireActor:
+    lda Ram_ActorType_eActor_arr, x
+    cmp #eActor::ProjFireball
+    beq _ExpireFireball
+    cmp #eActor::ProjBreakfire
+    beq _ExpireBreakfire
+    cmp #eActor::ProjBreakball
+    beq _ExpireBreakball
+    cmp #eActor::ProjFlamestrike
+    beq _ExpireFlamestrike
+    cmp #eActor::ProjSpine
+    beq _ExpireSpine
+    cmp #eActor::ProjBreakbomb
+    beq _ExpireBreakbomb
+    rts
+_ExpireBreakbomb:
+_ExpireFireball:
+_ExpireSpine:
+    ldy #eActor::SmokeParticle  ; param: actor type
+    jmp Func_InitActorDefault  ; preserves X
+_ExpireBreakfire:
+    lda #$c0  ; param: angle ($c0 = up)
+    jmp Func_InitActorSmokeParticle  ; preserves X
+_ExpireBreakball:
+    jmp Func_InitActorSmokeExplosion  ; preserves X
+_ExpireFlamestrike:
+    lda #eActor::None
+    sta Ram_ActorType_eActor_arr, x
+    rts
+.ENDPROC
+
 ;;;=========================================================================;;;
 
 .SEGMENT "PRGA_Objects"
diff --git a/src/rooms/boss_lava.asm b/src/rooms/boss_lava.asm
index d37a723..1c08b8c 100644
--- a/src/rooms/boss_lava.asm
+++ b/src/rooms/boss_lava.asm
@@ -98,6 +98,7 @@
 .IMPORT Ram_MachineGoalHorz_u8_arr
 .IMPORT Ram_Oam_sObj_arr64
 .IMPORT Ram_PlatformLeft_i16_0_arr
+.IMPORT Ram_PlatformType_ePlatform_arr
 .IMPORT Ram_PpuTransfer_arr
 .IMPORTZP Zp_Active_sIrq
 .IMPORTZP Zp_Buffered_sIrq
@@ -665,6 +666,8 @@ _BossHurt:
     bne _StartScuttling  ; boss is not dead yet
     .assert eBossMode::Dead = 0, error
     sta Zp_RoomState + sState::Current_eBossMode
+    lda #ePlatform::Zone
+    sta Ram_PlatformType_ePlatform_arr + kBossBodyPlatformIndex
     rts
 _StartScuttling:
     lda #eBossMode::Scuttling
@@ -976,7 +979,12 @@ _RegR:
 .PROC FuncA_Room_BossLava_EnterRoom
     ldax #DataC_Boss_Lava_sBoss  ; param: sBoss ptr
     jsr FuncA_Room_InitBoss  ; sets Z if boss is alive
-    bne _BossIsDead
+    beq _BossIsAlive
+_BossIsDead:
+    ;; Remove the boss's body.
+    lda #ePlatform::Zone
+    sta Ram_PlatformType_ePlatform_arr + kBossBodyPlatformIndex
+    rts
 _BossIsAlive:
     lda #kBossInitHealth
     sta Zp_RoomState + sState::BossHealth_u8
@@ -988,7 +996,6 @@ _BossIsAlive:
     lda #kBossInitGoalX
     sta Zp_RoomState + sState::BossGoalX_u8
     .assert kBossInitGoalY = 0, error
-_BossIsDead:
     rts
 .ENDPROC