diff --git a/asm/book.s b/asm/book.s
deleted file mode 100644
index fe75a238..00000000
--- a/asm/book.s
+++ /dev/null
@@ -1,450 +0,0 @@
-	.include "asm/macros.inc"
-
-	.include "constants/constants.inc"
-
-	.syntax unified
-
-	.text
-
-
-	thumb_func_start Book
-Book: @ 0x0809B3AC
-	push {lr}
-	ldr r2, _0809B3C0 @ =gUnk_08123D7C
-	ldrb r1, [r0, #0xc]
-	lsls r1, r1, #2
-	adds r1, r1, r2
-	ldr r1, [r1]
-	bl _call_via_r1
-	pop {pc}
-	.align 2, 0
-_0809B3C0: .4byte gUnk_08123D7C
-
-	thumb_func_start sub_0809B3C4
-sub_0809B3C4: @ 0x0809B3C4
-	push {r4, r5, lr}
-	adds r4, r0, #0
-	ldrb r0, [r4, #0xa]
-	adds r0, #0x39
-	bl GetInventoryValue
-	adds r5, r0, #0
-	ldrb r0, [r4, #0xb]
-	cmp r0, #3
-	beq _0809B3E2
-	cmp r5, #0
-	beq _0809B3FE
-	bl DeleteThisEntity
-	b _0809B3FE
-_0809B3E2:
-	movs r0, #0x73
-	bl CheckLocalFlag
-	cmp r0, #0
-	beq _0809B3F0
-	bl DeleteThisEntity
-_0809B3F0:
-	cmp r5, #2
-	beq _0809B3FE
-	ldrb r1, [r4, #0x18]
-	movs r0, #4
-	rsbs r0, r0, #0
-	ands r0, r1
-	strb r0, [r4, #0x18]
-_0809B3FE:
-	adds r1, r4, #0
-	adds r1, #0x63
-	movs r0, #3
-	strb r0, [r1]
-	adds r0, r4, #0
-	adds r0, #0x86
-	ldrh r0, [r0]
-	bl CheckFlags
-	cmp r0, #0
-	beq _0809B424
-	ldrb r0, [r4, #0xb]
-	cmp r0, #0
-	bne _0809B420
-	ldrh r0, [r4, #0x32]
-	adds r0, #0x30
-	strh r0, [r4, #0x32]
-_0809B420:
-	movs r0, #2
-	strb r0, [r4, #0xb]
-_0809B424:
-	adds r0, r4, #0
-	bl UpdateSpriteForCollisionLayer
-	ldrb r1, [r4, #0xa]
-	adds r1, #0x39
-	adds r0, r4, #0
-	bl InitAnimationForceUpdate
-	ldrb r1, [r4, #0xb]
-	cmp r1, #1
-	beq _0809B46C
-	cmp r1, #1
-	bgt _0809B444
-	cmp r1, #0
-	beq _0809B44E
-	b _0809B4A6
-_0809B444:
-	cmp r1, #2
-	beq _0809B488
-	cmp r1, #3
-	beq _0809B48E
-	b _0809B4A6
-_0809B44E:
-	movs r0, #1
-	strb r0, [r4, #0xc]
-	movs r0, #0x16
-	strb r0, [r4, #0xe]
-	movs r0, #2
-	strb r0, [r4, #0xf]
-	adds r0, r4, #0
-	adds r0, #0x80
-	strb r1, [r0]
-	adds r2, r4, #0
-	adds r2, #0x29
-	ldrb r1, [r2]
-	movs r0, #8
-	rsbs r0, r0, #0
-	b _0809B49E
-_0809B46C:
-	movs r0, #3
-	strb r0, [r4, #0xc]
-	ldr r0, _0809B484 @ =gRoomControls
-	ldrh r0, [r0, #0xc]
-	subs r0, #0x10
-	ldrh r1, [r4, #0x32]
-	subs r1, r1, r0
-	ldrh r0, [r4, #0x36]
-	subs r0, r0, r1
-	strh r0, [r4, #0x36]
-	b _0809B4A6
-	.align 2, 0
-_0809B484: .4byte gRoomControls
-_0809B488:
-	movs r0, #4
-	strb r0, [r4, #0xc]
-	b _0809B4A6
-_0809B48E:
-	movs r1, #0
-	movs r0, #5
-	strb r0, [r4, #0xc]
-	strb r1, [r4, #0xd]
-	adds r2, r4, #0
-	adds r2, #0x29
-	ldrb r1, [r2]
-	subs r0, #0xd
-_0809B49E:
-	ands r0, r1
-	movs r1, #3
-	orrs r0, r1
-	strb r0, [r2]
-_0809B4A6:
-	pop {r4, r5, pc}
-
-	thumb_func_start sub_0809B4A8
-sub_0809B4A8: @ 0x0809B4A8
-	push {r4, lr}
-	adds r4, r0, #0
-	bl sub_0800445C
-	adds r1, r4, #0
-	adds r1, #0x80
-	ldrb r0, [r1]
-	cmp r0, #0
-	beq _0809B4C0
-	subs r0, #1
-	strb r0, [r1]
-	b _0809B520
-_0809B4C0:
-	adds r0, r4, #0
-	bl sub_0809B688
-	cmp r0, #0
-	beq _0809B51C
-	ldrb r0, [r4, #0xe]
-	subs r0, #1
-	strb r0, [r4, #0xe]
-	lsls r0, r0, #0x18
-	lsrs r3, r0, #0x18
-	cmp r3, #0
-	bne _0809B520
-	movs r0, #2
-	strb r0, [r4, #0xc]
-	movs r0, #0x1e
-	strb r0, [r4, #0xe]
-	movs r0, #0x40
-	strh r0, [r4, #0x24]
-	movs r0, #0x10
-	strb r0, [r4, #0x15]
-	ldr r2, _0809B510 @ =gPlayerState
-	movs r0, #0x9e
-	strb r0, [r2, #6]
-	movs r0, #5
-	strb r0, [r2, #0xc]
-	ldr r0, [r2, #0x30]
-	movs r1, #1
-	orrs r0, r1
-	str r0, [r2, #0x30]
-	ldr r1, _0809B514 @ =gPlayerEntity
-	strh r3, [r1, #0x2c]
-	strh r3, [r1, #0x30]
-	ldrb r0, [r1, #0x14]
-	lsls r0, r0, #2
-	strb r0, [r1, #0x15]
-	ldr r0, _0809B518 @ =0x0000010F
-	bl EnqueueSFX
-	b _0809B520
-	.align 2, 0
-_0809B510: .4byte gPlayerState
-_0809B514: .4byte gPlayerEntity
-_0809B518: .4byte 0x0000010F
-_0809B51C:
-	movs r0, #0x16
-	strb r0, [r4, #0xe]
-_0809B520:
-	pop {r4, pc}
-	.align 2, 0
-
-	thumb_func_start sub_0809B524
-sub_0809B524: @ 0x0809B524
-	push {lr}
-	adds r2, r0, #0
-	ldrb r0, [r2, #0xe]
-	subs r0, #1
-	strb r0, [r2, #0xe]
-	movs r1, #0xff
-	lsls r0, r0, #0x18
-	cmp r0, #0
-	bne _0809B564
-	ldrb r0, [r2, #0xf]
-	subs r0, #1
-	strb r0, [r2, #0xf]
-	ands r0, r1
-	cmp r0, #0
-	bne _0809B554
-	movs r0, #3
-	strb r0, [r2, #0xc]
-	ldrh r0, [r2, #0x32]
-	adds r0, #0x20
-	strh r0, [r2, #0x32]
-	ldrh r0, [r2, #0x36]
-	subs r0, #0x20
-	strh r0, [r2, #0x36]
-	b _0809B564
-_0809B554:
-	movs r0, #1
-	strb r0, [r2, #0xc]
-	movs r0, #0x16
-	strb r0, [r2, #0xe]
-	adds r1, r2, #0
-	adds r1, #0x80
-	movs r0, #0x18
-	strb r0, [r1]
-_0809B564:
-	adds r0, r2, #0
-	bl sub_0806F69C
-	pop {pc}
-
-	thumb_func_start sub_0809B56C
-sub_0809B56C: @ 0x0809B56C
-	push {r4, lr}
-	adds r4, r0, #0
-	movs r1, #0xa0
-	lsls r1, r1, #6
-	bl sub_080044EC
-	cmp r0, #1
-	bne _0809B5B0
-	movs r2, #4
-	movs r0, #4
-	strb r0, [r4, #0xc]
-	adds r3, r4, #0
-	adds r3, #0x29
-	ldrb r1, [r3]
-	subs r0, #0xc
-	ands r0, r1
-	orrs r0, r2
-	strb r0, [r3]
-	adds r0, r4, #0
-	adds r0, #0x86
-	ldrh r0, [r0]
-	bl SetFlag
-	adds r0, r4, #0
-	movs r1, #2
-	movs r2, #0
-	bl CreateFx
-	adds r1, r0, #0
-	cmp r1, #0
-	beq _0809B5B0
-	adds r0, r4, #0
-	bl ResolveEntityOnTop
-_0809B5B0:
-	pop {r4, pc}
-	.align 2, 0
-
-	thumb_func_start sub_0809B5B4
-sub_0809B5B4: @ 0x0809B5B4
-	push {r4, lr}
-	adds r4, r0, #0
-	ldr r0, _0809B5CC @ =gPlayerState
-	ldr r0, [r0, #0x30]
-	movs r1, #0x80
-	ands r0, r1
-	cmp r0, #0
-	beq _0809B5D0
-	adds r0, r4, #0
-	bl sub_0800445C
-	b _0809B5EA
-	.align 2, 0
-_0809B5CC: .4byte gPlayerState
-_0809B5D0:
-	adds r0, r4, #0
-	bl sub_08017850
-	cmp r0, #0
-	beq _0809B5EA
-	ldrb r0, [r4, #0xa]
-	adds r0, #0x39
-	movs r1, #0
-	movs r2, #0
-	bl CreateItemEntity
-	bl DeleteThisEntity
-_0809B5EA:
-	pop {r4, pc}
-
-	thumb_func_start sub_0809B5EC
-sub_0809B5EC: @ 0x0809B5EC
-	push {r4, r5, lr}
-	adds r4, r0, #0
-	ldrb r1, [r4, #0x18]
-	lsls r0, r1, #0x1e
-	lsrs r5, r0, #0x1e
-	cmp r5, #1
-	bne _0809B646
-	ldrb r0, [r4, #0xd]
-	cmp r0, #0
-	beq _0809B606
-	cmp r0, #1
-	beq _0809B630
-	b _0809B682
-_0809B606:
-	movs r0, #7
-	movs r1, #0x1a
-	movs r2, #7
-	bl FindEntityByID
-	adds r2, r0, #0
-	cmp r2, #0
-	beq _0809B682
-	movs r0, #0x2e
-	ldrsh r1, [r2, r0]
-	movs r3, #0x2e
-	ldrsh r0, [r4, r3]
-	cmp r1, r0
-	blt _0809B682
-	ldrb r0, [r2, #0x14]
-	cmp r0, #4
-	bne _0809B682
-	str r2, [r4, #0x50]
-	strb r5, [r4, #0xd]
-	adds r0, r2, #0
-	b _0809B63E
-_0809B630:
-	ldr r1, [r4, #0x50]
-	cmp r1, #0
-	beq _0809B650
-	ldr r0, [r1, #4]
-	cmp r0, #0
-	beq _0809B650
-	adds r0, r1, #0
-_0809B63E:
-	adds r1, r4, #0
-	bl sub_0809B6B0
-	b _0809B682
-_0809B646:
-	ldrb r0, [r4, #0xd]
-	cmp r0, #0
-	beq _0809B656
-	cmp r0, #1
-	beq _0809B668
-_0809B650:
-	bl DeleteThisEntity
-	b _0809B682
-_0809B656:
-	ldrb r0, [r4, #0xa]
-	adds r0, #0x39
-	bl GetInventoryValue
-	cmp r0, #2
-	bne _0809B682
-	movs r0, #1
-	strb r0, [r4, #0xd]
-	b _0809B682
-_0809B668:
-	ldr r0, _0809B684 @ =gTextBox
-	ldrb r0, [r0]
-	movs r2, #0x7f
-	ands r2, r0
-	cmp r2, #0
-	bne _0809B682
-	movs r0, #4
-	rsbs r0, r0, #0
-	ands r0, r1
-	movs r1, #1
-	orrs r0, r1
-	strb r0, [r4, #0x18]
-	strb r2, [r4, #0xd]
-_0809B682:
-	pop {r4, r5, pc}
-	.align 2, 0
-_0809B684: .4byte gTextBox
-
-	thumb_func_start sub_0809B688
-sub_0809B688: @ 0x0809B688
-	push {lr}
-	ldr r1, _0809B6A8 @ =gPlayerEntity
-	movs r2, #6
-	movs r3, #0xc
-	bl sub_080041A0
-	adds r1, r0, #0
-	cmp r1, #1
-	bne _0809B6A4
-	ldr r0, _0809B6AC @ =gPlayerState
-	ldrb r0, [r0, #0xd]
-	cmp r0, #0x10
-	beq _0809B6A4
-	movs r1, #0
-_0809B6A4:
-	adds r0, r1, #0
-	pop {pc}
-	.align 2, 0
-_0809B6A8: .4byte gPlayerEntity
-_0809B6AC: .4byte gPlayerState
-
-	thumb_func_start sub_0809B6B0
-sub_0809B6B0: @ 0x0809B6B0
-	push {r4, lr}
-	adds r4, r1, #0
-	ldr r2, _0809B6EC @ =gUnk_08123D94
-	ldrb r1, [r0, #0x14]
-	lsrs r1, r1, #1
-	adds r1, r1, r2
-	movs r3, #0
-	ldrsb r3, [r1, r3]
-	lsls r3, r3, #0x10
-	adds r1, r4, #0
-	movs r2, #0
-	bl PositionRelative
-	ldrb r0, [r4, #0xa]
-	lsls r0, r0, #2
-	rsbs r0, r0, #0
-	strh r0, [r4, #0x36]
-	ldrb r0, [r4, #0xa]
-	movs r1, #3
-	subs r1, r1, r0
-	adds r4, #0x29
-	movs r0, #7
-	ands r1, r0
-	ldrb r2, [r4]
-	movs r0, #8
-	rsbs r0, r0, #0
-	ands r0, r2
-	orrs r0, r1
-	strb r0, [r4]
-	pop {r4, pc}
-	.align 2, 0
-_0809B6EC: .4byte gUnk_08123D94
diff --git a/data/const/object/books.s b/data/const/object/books.s
deleted file mode 100644
index 8e75c69c..00000000
--- a/data/const/object/books.s
+++ /dev/null
@@ -1,16 +0,0 @@
-	.include "asm/macros.inc"
-	.include "constants/constants.inc"
-
-	.section .rodata
-    .align 2
-
-gUnk_08123D7C:: @ 08123D7C
-	.4byte sub_0809B3C4
-	.4byte sub_0809B4A8
-	.4byte sub_0809B524
-	.4byte sub_0809B56C
-	.4byte sub_0809B5B4
-	.4byte sub_0809B5EC
-
-gUnk_08123D94:: @ 08123D94
-	.incbin "baserom.gba", 0x123D94, 0x0000004
diff --git a/include/entity.h b/include/entity.h
index f19e0876..ca4bd10d 100644
--- a/include/entity.h
+++ b/include/entity.h
@@ -81,7 +81,7 @@ typedef struct Entity {
     /*    */        u8 b0 : 4;
     /*    */        u8 b4 : 4;
     /*    */    } PACKED b;
-    /*    */} PACKED palette;
+    /*    */ } PACKED palette;
     /*0x1b*/ struct {
     /*    */     u32 b0    : 1;
     /*    */     u32 b1    : 5; //0x10
diff --git a/linker.ld b/linker.ld
index 8f3dfc92..ebb0cc59 100644
--- a/linker.ld
+++ b/linker.ld
@@ -850,7 +850,7 @@ SECTIONS {
         asm/object89.o(.text);
         asm/object8A.o(.text);
         asm/object8B.o(.text);
-        asm/book.o(.text);
+        src/object/book.o(.text);
         asm/fireplace.o(.text);
         asm/object8E.o(.text);
         asm/frozenWaterElement.o(.text);
@@ -1129,7 +1129,8 @@ SECTIONS {
         data/animations/enemy/mazaalBracelet.o(.rodata);
         data/const/enemy/takkuri.o(.rodata);
         data/const/enemy/bowMoblin.o(.rodata);
-        data/animations/enemy/bowMoblin.o(.rodata);        src/enemy/lakitu.o(.rodata);
+        data/animations/enemy/bowMoblin.o(.rodata);
+        src/enemy/lakitu.o(.rodata);
         data/animations/enemy/lakitu.o(.rodata);
         src/enemy/lakituCloud.o(.rodata);
         data/const/enemy/enemy49.o(.rodata);
@@ -1591,7 +1592,7 @@ data/const/object/object1D.o(.rodata);
         data/const/object/object89.o(.rodata);
         data/const/object/object8A.o(.rodata);
         data/const/object/object8B.o(.rodata);
-        data/const/object/books.o(.rodata);
+        src/object/book.o(.rodata);
         data/const/object/fireplace.o(.rodata);
         data/const/object/object8E.o(.rodata);
         data/const/object/frozenWaterElement.o(.rodata);
diff --git a/src/object/book.c b/src/object/book.c
new file mode 100644
index 00000000..fa560142
--- /dev/null
+++ b/src/object/book.c
@@ -0,0 +1,238 @@
+#include "entity.h"
+#include "functions.h"
+#include "player.h"
+#include "script.h"
+#include "flags.h"
+#include "room.h"
+#include "textbox.h"
+
+extern void (*const BookActionFuncs[])(Entity*);
+extern s8 const gUnk_08123D94[];
+
+u32 sub_0809B688(Entity*);
+void sub_0809B6B0(Entity*, Entity*);
+
+void Book(Entity* this) {
+    BookActionFuncs[this->action](this);
+}
+
+void sub_0809B3C4(Entity* this) {
+    u32 obtained;
+
+    obtained = GetInventoryValue(this->type + 0x39);
+    if (this->type2 != 3) {
+        if (obtained) {
+            DeleteThisEntity();
+        }
+    } else {
+        if (CheckLocalFlag(0x73)) {
+            DeleteThisEntity();
+        }
+
+        if (obtained != 2) {
+            this->spriteSettings.b.draw = 0;
+        }
+    }
+
+    this->spriteOffsetY = 3;
+    if (CheckFlags(this->field_0x86.HWORD)) {
+        if (this->type2 == 0) {
+            this->y.HALF.HI += 48;
+        }
+
+        this->type2 = 2;
+    }
+
+    UpdateSpriteForCollisionLayer(this);
+    InitAnimationForceUpdate(this, this->type + 0x39);
+
+    switch (this->type2) {
+        case 0:
+            this->action = 1;
+            this->actionDelay = 22;
+            this->field_0xf = 2;
+            this->field_0x80.HALF.LO = 0;
+            this->spritePriority.b0 = 3;
+            break;
+        case 1: {
+            u32 scroll;
+            u32 height;
+            this->action = 3;
+            scroll = (u16)gRoomControls.roomScrollY - 0x10;
+            height = (u16)this->y.HALF.HI - scroll;
+            this->height.HALF.HI -= height;
+            return;
+        }
+        case 2:
+            this->action = 4;
+            return;
+        case 3:
+            this->action = 5;
+            this->subAction = 0;
+            this->spritePriority.b0 = 3;
+            break;
+        default:
+            return;
+    }
+}
+
+void sub_0809B4A8(Entity* this) {
+    sub_0800445C(this);
+
+    if (this->field_0x80.HALF.LO != 0) {
+        this->field_0x80.HALF.LO--;
+        return;
+    }
+    
+    if (sub_0809B688(this)) {
+        if (--this->actionDelay) {
+            return;
+        }
+
+        this->action = 2;
+        this->actionDelay = 30;
+        this->speed = 64;
+        this->direction = 16;
+
+        gPlayerState.pushedObject = 0x9e;
+        gPlayerState.playerAction = 5;
+        gPlayerState.flags.all |= 1;
+
+        gPlayerEntity.x.HALF.LO = 0;
+        gPlayerEntity.y.HALF.LO = 0;
+        gPlayerEntity.direction = gPlayerEntity.animationState << 2;
+        EnqueueSFX(0x10f);
+    }
+    else {
+        this->actionDelay = 0x16;
+    }
+}
+
+void sub_0809B524(Entity* this) {
+    if (--this->actionDelay == 0) {
+        if (--this->field_0xf == 0) {
+            this->action = 3;
+            this->y.HALF.HI += 32;
+            this->height.HALF.HI -= 32;
+        }
+        else {
+            this->action = 1;
+            this->actionDelay = 22;
+            this->field_0x80.HALF.LO = 24;
+        }
+    }
+
+    sub_0806F69C(this);
+}
+
+void sub_0809B56C(Entity* this) {
+    Entity* fx;
+
+    if (sub_080044EC(this, 0x2800) != 1) {
+        return;
+    }
+
+    this->action = 4;
+    this->spritePriority.b0 = 4;
+
+    SetFlag(this->field_0x86.HWORD);
+
+    fx = CreateFx(this, 2, 0);
+    if (fx) {
+        ResolveEntityOnTop(this, fx);
+    }
+}
+
+void sub_0809B5B4(Entity* this) {
+    if (gPlayerState.flags.all & 0x80) {
+        sub_0800445C(this);
+    }
+    else if (sub_08017850(this)) {
+        CreateItemEntity(this->type + 0x39, 0, 0);
+        DeleteThisEntity();
+    }
+}
+
+void sub_0809B5EC(Entity* this) {
+    if (this->spriteSettings.b.draw == 1) {
+        switch (this->subAction) {
+            case 0: {
+                Entity* parent;
+                parent = FindEntityByID(7, 26, 7);
+                if (!parent) return;
+                if (parent->x.HALF.HI < this->x.HALF.HI) return;
+                if (parent->animationState != 4) return;
+
+                this->parent = parent;
+                this->subAction = 1;
+                sub_0809B6B0(this->parent, this);
+                break;
+            }
+            case 1: {
+                if (!this->parent || !this->parent->next) {
+                    DeleteThisEntity();
+                    return;
+                }
+                sub_0809B6B0(this->parent, this);
+                break;
+            }
+            default: return;
+        }
+
+        
+    }
+    else {
+        switch (this->subAction) {
+            default: {
+                DeleteThisEntity();
+                break;
+            }
+            case 0: {
+                if (GetInventoryValue(this->type + 0x39) == 2) {
+                    this->subAction = 1;
+                }
+                break;
+            }
+            case 1: {
+                u8 doTextBox = gTextBox.doTextBox & 0x7f;
+                if (!doTextBox) {
+                    this->spriteSettings.b.draw = 1; 
+                    this->subAction = doTextBox;
+                }
+                break;
+            }
+        }
+    }
+}
+
+u32 sub_0809B688(Entity* this) {
+    u32 ret;
+
+    ret = sub_080041A0(this, &gPlayerEntity, 6, 12);
+    if (ret == 1 && gPlayerState.field_0xd != 16) {
+        ret = 0;
+    }
+
+    return ret;
+}
+
+void sub_0809B6B0(Entity* parent, Entity* this) {
+    s32 offset;
+    offset = (s32)gUnk_08123D94[parent->animationState >> 1] << 16;
+
+    PositionRelative(parent, this, 0, offset);
+
+    this->height.HALF.HI = -(this->type << 2);
+    this->spritePriority.b0 = 3 - this->type;
+}
+
+void (*const BookActionFuncs[])(Entity*) = {
+    sub_0809B3C4,
+    sub_0809B4A8,
+    sub_0809B524,
+    sub_0809B56C,
+    sub_0809B5B4,
+    sub_0809B5EC
+};
+
+const s8 gUnk_08123D94[] = { -22, -20, -20, -20 };
\ No newline at end of file