diff --git a/asm/object/objectAB.s b/asm/object/objectAB.s
deleted file mode 100644
index cbecc43b..00000000
--- a/asm/object/objectAB.s
+++ /dev/null
@@ -1,124 +0,0 @@
-	.include "asm/macros.inc"
-
-	.include "constants/constants.inc"
-
-	.syntax unified
-
-	.text
-
-
-	thumb_func_start ObjectAB
-ObjectAB: @ 0x080A00E0
-	push {lr}
-	ldr r2, _080A00F4 @ =gUnk_0812486C
-	ldrb r1, [r0, #0xc]
-	lsls r1, r1, #2
-	adds r1, r1, r2
-	ldr r1, [r1]
-	bl _call_via_r1
-	pop {pc}
-	.align 2, 0
-_080A00F4: .4byte gUnk_0812486C
-
-	thumb_func_start sub_080A00F8
-sub_080A00F8: @ 0x080A00F8
-	push {lr}
-	ldrb r1, [r0, #0xc]
-	adds r1, #1
-	movs r3, #0
-	strb r1, [r0, #0xc]
-	adds r2, r0, #0
-	adds r2, #0x38
-	movs r1, #1
-	strb r1, [r2]
-	ldrb r1, [r0, #0x19]
-	movs r2, #0xc0
-	orrs r1, r2
-	strb r1, [r0, #0x19]
-	movs r1, #0x29
-	adds r1, r1, r0
-	mov ip, r1
-	ldrb r1, [r1]
-	movs r2, #7
-	orrs r1, r2
-	mov r2, ip
-	strb r1, [r2]
-	strb r3, [r0, #0xd]
-	movs r1, #0
-	bl InitializeAnimation
-	pop {pc}
-
-	thumb_func_start sub_080A012C
-sub_080A012C: @ 0x080A012C
-	push {r4, lr}
-	adds r4, r0, #0
-	movs r0, #0
-	bl CheckRoomFlag
-	cmp r0, #0
-	beq _080A0154
-	adds r0, r4, #0
-	bl GetNextFrame
-	adds r0, r4, #0
-	adds r0, #0x5a
-	ldrb r1, [r0]
-	movs r0, #0x80
-	ands r0, r1
-	cmp r0, #0
-	beq _080A0154
-	ldrb r0, [r4, #0xc]
-	adds r0, #1
-	strb r0, [r4, #0xc]
-_080A0154:
-	pop {r4, pc}
-	.align 2, 0
-
-	thumb_func_start sub_080A0158
-sub_080A0158: @ 0x080A0158
-	push {r4, lr}
-	adds r4, r0, #0
-	movs r0, #1
-	bl CheckRoomFlag
-	cmp r0, #0
-	beq _080A018A
-	adds r0, r4, #0
-	bl sub_080A0190
-	adds r0, r4, #0
-	movs r1, #0x1e
-	bl RequestPriorityDuration
-	ldr r1, _080A018C @ =gPlayerEntity
-	adds r0, r4, #0
-	movs r2, #0x10
-	movs r3, #0x10
-	bl EntityInRectRadius
-	cmp r0, #0
-	beq _080A018A
-	movs r0, #0x37
-	bl sub_0805B390
-_080A018A:
-	pop {r4, pc}
-	.align 2, 0
-_080A018C: .4byte gPlayerEntity
-
-	thumb_func_start sub_080A0190
-sub_080A0190: @ 0x080A0190
-	push {r4, lr}
-	movs r4, #0
-	movs r1, #1
-	strb r1, [r0, #0xd]
-	ldr r1, _080A01B8 @ =gPlayerEntity
-	bl CopyPosition
-	ldr r2, _080A01BC @ =gPlayerState
-	movs r0, #3
-	strb r0, [r2, #0xc]
-	adds r0, r2, #0
-	adds r0, #0x38
-	strb r4, [r0]
-	ldr r0, [r2, #0x30]
-	movs r1, #0x80
-	lsls r1, r1, #8
-	orrs r0, r1
-	str r0, [r2, #0x30]
-	pop {r4, pc}
-	.align 2, 0
-_080A01B8: .4byte gPlayerEntity
-_080A01BC: .4byte gPlayerState
diff --git a/data/const/object/objectAB.s b/data/const/object/objectAB.s
deleted file mode 100644
index 3ac4b9fb..00000000
--- a/data/const/object/objectAB.s
+++ /dev/null
@@ -1,10 +0,0 @@
-	.include "asm/macros.inc"
-	.include "constants/constants.inc"
-
-	.section .rodata
-    .align 2
-
-gUnk_0812486C:: @ 0812486C
-	.4byte sub_080A00F8
-	.4byte sub_080A012C
-	.4byte sub_080A0158
diff --git a/linker.ld b/linker.ld
index dd556b89..55cc76e7 100644
--- a/linker.ld
+++ b/linker.ld
@@ -796,7 +796,7 @@ SECTIONS {
         src/object/objectA8.o(.text);
         src/object/objectA9.o(.text);
         src/object/waterfallOpening.o(.text);
-        asm/object/objectAB.o(.text);
+        src/object/objectAB.o(.text);
         src/object/fourElements.o(.text);
         asm/object/objectAD.o(.text);
         src/object/floatingBlock.o(.text);
@@ -1549,7 +1549,7 @@ SECTIONS {
         src/object/objectA8.o(.rodata);
         src/object/objectA9.o(.rodata);
         src/object/waterfallOpening.o(.rodata);
-        data/const/object/objectAB.o(.rodata);
+        src/object/objectAB.o(.rodata);
         data/animations/object/objectAB.o(.rodata);
         src/object/fourElements.o(.rodata);
         data/const/object/objectAD.o(.rodata);
diff --git a/src/object/objectAB.c b/src/object/objectAB.c
new file mode 100644
index 00000000..47100a71
--- /dev/null
+++ b/src/object/objectAB.c
@@ -0,0 +1,59 @@
+#define NENT_DEPRECATED
+#include "entity.h"
+#include "flags.h"
+#include "asm.h"
+#include "player.h"
+#include "coord.h"
+
+extern void sub_0805B390(u32);
+
+void ObjectAB_Init(Entity*);
+void ObjectAB_Action1(Entity*);
+void ObjectAB_Action2(Entity*);
+void sub_080A0190(Entity*);
+
+void ObjectAB(Entity* this) {
+    static void (*const actionFuncs[])(Entity*) = {
+        ObjectAB_Init,
+        ObjectAB_Action1,
+        ObjectAB_Action2,
+    };
+
+    actionFuncs[this->action]((Entity*)this);
+}
+
+void ObjectAB_Init(Entity* this) {
+    this->action++;
+    this->collisionLayer = 1;
+    this->spriteRendering.b3 = 3;
+    this->spritePriority.b0 = 7;
+    this->subAction = 0;
+    InitializeAnimation(this, 0);
+}
+
+void ObjectAB_Action1(Entity* this) {
+    if (CheckRoomFlag(0)) {
+        GetNextFrame(this);
+        if (this->frame & 0x80) {
+            this->action++;
+        }
+    }
+}
+
+void ObjectAB_Action2(Entity* this) {
+    if (CheckRoomFlag(1)) {
+        sub_080A0190(this);
+        RequestPriorityDuration(this, 0x1e);
+        if (EntityInRectRadius(this, &gPlayerEntity, 0x10, 0x10)) {
+            sub_0805B390(0x37);
+        }
+    }
+}
+
+void sub_080A0190(Entity* this) {
+    this->subAction = 1;
+    CopyPosition(this, &gPlayerEntity);
+    gPlayerState.queued_action = 3;
+    gPlayerState.field_0x38 = 0;
+    gPlayerState.flags |= PL_FLAGS8000;
+}