diff --git a/include/functions.h b/include/functions.h
index 30949ee511..22c750d2ba 100644
--- a/include/functions.h
+++ b/include/functions.h
@@ -896,7 +896,7 @@ void func_800BD9A0(void); // func_800BD9A0
 void func_800BD9E0(UNK_TYPE1 param_1, UNK_TYPE1 param_2, UNK_TYPE1 param_3, UNK_TYPE1 param_4, UNK_TYPE4 param_5, UNK_TYPE2 param_6); // func_800BD9E0
 void func_800BDAA0(UNK_TYPE1 param_1, UNK_TYPE1 param_2, UNK_TYPE1 param_3, UNK_TYPE1 param_4, UNK_TYPE4 param_5, UNK_TYPE2 param_6); // func_800BDAA0
 void func_800BDB6C(void); // func_800BDB6C
-void func_800BDC5C(void); // func_800BDC5C
+void func_800BDC5C(SkelAnime* skelAnime, UNK_PTR animation, UNK_TYPE param_3); // func_800BDC5C
 void func_800BDCF4(void); // func_800BDCF4
 void func_800BDFB0(void); // func_800BDFB0
 void func_800BDFC0(GlobalContext* ctxt, UNK_TYPE4 uParm2); // func_800BDFC0
diff --git a/include/functions_overlay.h b/include/functions_overlay.h
index 367869f3d8..3be2690d35 100644
--- a/include/functions_overlay.h
+++ b/include/functions_overlay.h
@@ -13092,8 +13092,8 @@ void func_80C25D84(void); // func_80C25D84
 void EnRsn_Init(void); // func_80C25D94
 void EnRsn_Destroy(void); // func_80C25E14
 void EnRsn_Update(void); // func_80C25E38
-void func_80C25EB0(UNK_TYPE1 param_1, UNK_TYPE1 param_2, UNK_TYPE1 param_3, UNK_TYPE1 param_4, UNK_TYPE1 param_5, UNK_TYPE4 param_6); // func_80C25EB0
-void func_80C25EF0(UNK_TYPE1 param_1, UNK_TYPE1 param_2, UNK_TYPE1 param_3, UNK_TYPE1 param_4, UNK_TYPE4 param_5); // func_80C25EF0
+void EnRsn_OverrideLimbDraw(UNK_TYPE1 param_1, UNK_TYPE1 param_2, UNK_TYPE1 param_3, UNK_TYPE1 param_4, UNK_TYPE1 param_5, UNK_TYPE4 param_6); // EnRsn_OverrideLimbDraw
+void EnRsn_PostLimbDraw(UNK_TYPE1 param_1, UNK_TYPE1 param_2, UNK_TYPE1 param_3, UNK_TYPE1 param_4, UNK_TYPE4 param_5); // EnRsn_PostLimbDraw
 void EnRsn_Draw(void); // func_80C25F4C
 
 #endif
diff --git a/linker_scripts/code_script.txt b/linker_scripts/code_script.txt
index 25647656d2..70beb8756c 100644
--- a/linker_scripts/code_script.txt
+++ b/linker_scripts/code_script.txt
@@ -8767,8 +8767,9 @@ SECTIONS
     ovl_En_Rsn : AT(RomLocation)
     {
         build/src/overlays/actors/ovl_En_Rsn/z_en_rsn.o(.text)
-        build/asm/ovl_En_Rsn_data.o(.data)
-        build/asm/ovl_En_Rsn_rodata.o(.rodata)
+        build/src/overlays/actors/ovl_En_Rsn/z_en_rsn.o(.data)
+        build/src/overlays/actors/ovl_En_Rsn/z_en_rsn.o(.rodata)
+        build/src/overlays/actors/ovl_En_Rsn/z_en_rsn_overlay.o(.ovl)
     }
     SegmentEnd = .;
     SegmentSize = SegmentEnd - SegmentStart;
diff --git a/linker_scripts/object_script.txt b/linker_scripts/object_script.txt
index 2add037fb1..fedebf96ec 100644
--- a/linker_scripts/object_script.txt
+++ b/linker_scripts/object_script.txt
@@ -48,6 +48,12 @@ D_06018DA0 = 0x06018DA0;
 D_0601EF10 = 0x0601EF10;
 D_06018C60 = 0x06018C60;
 
+/* z_en_rsn */
+D_06009220 = 0x06009220;
+D_06009120 = 0x06009120;
+D_06005458 = 0x06005458;
+D_0600788C = 0x0600788C;
+
 /* en_ending_hero4 */
 D_0600D640 = 0x0600D640;
 D_06002A84 = 0x06002A84;
diff --git a/src/overlays/actors/ovl_En_Rsn/z_en_rsn.c b/src/overlays/actors/ovl_En_Rsn/z_en_rsn.c
index 72e808def4..91a28363e7 100644
--- a/src/overlays/actors/ovl_En_Rsn/z_en_rsn.c
+++ b/src/overlays/actors/ovl_En_Rsn/z_en_rsn.c
@@ -9,7 +9,17 @@ void EnRsn_Destroy(Actor* thisx, GlobalContext* globalCtx);
 void EnRsn_Update(Actor* thisx, GlobalContext* globalCtx);
 void EnRsn_Draw(Actor* thisx, GlobalContext* globalCtx);
 
-/*
+void func_80C25D84(EnRsn* this, GlobalContext* globalCtx);
+
+typedef struct {
+    /* 0x00 */ AnimationHeader* animation;
+    /* 0x04 */ f32 playbackSpeed;
+    /* 0x08 */ f32 unk_08;
+    /* 0x0C */ f32 frameCount;
+    /* 0x10 */ u8 unk_10;
+    /* 0x14 */ f32 transitionRate;
+} EnRsn_AnimationStruct; // size = 0x18
+
 const ActorInit En_Rsn_InitVars = {
     ACTOR_EN_RSN,
     ACTORTYPE_NPC,
@@ -19,22 +29,77 @@ const ActorInit En_Rsn_InitVars = {
     (ActorFunc)EnRsn_Init,
     (ActorFunc)EnRsn_Destroy,
     (ActorFunc)EnRsn_Update,
-    (ActorFunc)EnRsn_Draw
+    (ActorFunc)EnRsn_Draw,
 };
-*/
 
-GLOBAL_ASM("asm/non_matchings/ovl_En_Rsn_0x80C25D40/func_80C25D40.asm")
+extern SkeletonHeader D_06009220;
+extern AnimationHeader D_06009120;
+extern AnimationHeader D_0600788C;
+extern Gfx D_06005458[];
 
-GLOBAL_ASM("asm/non_matchings/ovl_En_Rsn_0x80C25D40/func_80C25D84.asm")
+static EnRsn_AnimationStruct animation = { &D_0600788C, 1.0f, 0.0f, 0.0f, 0x00, 0.0f };
 
-GLOBAL_ASM("asm/non_matchings/ovl_En_Rsn_0x80C25D40/EnRsn_Init.asm")
+void func_80C25D40(EnRsn* this) {
+    func_800BDC5C(&this->skelAnime, &animation, 0);
+    this->actionFunc = func_80C25D84;
+}
 
-GLOBAL_ASM("asm/non_matchings/ovl_En_Rsn_0x80C25D40/EnRsn_Destroy.asm")
+void func_80C25D84(EnRsn* this, GlobalContext* globalCtx) {
+}
 
-GLOBAL_ASM("asm/non_matchings/ovl_En_Rsn_0x80C25D40/EnRsn_Update.asm")
+void EnRsn_Init(Actor* thisx, GlobalContext* globalCtx) {
+    EnRsn* this = THIS;
 
-GLOBAL_ASM("asm/non_matchings/ovl_En_Rsn_0x80C25D40/func_80C25EB0.asm")
+    Actor_SetDrawParams(&this->actor.shape, 0.0f, func_800B3FC0, 20.0f);
+    SkelAnime_InitSV(globalCtx, &this->skelAnime, &D_06009220, &D_06009120, NULL, NULL, 0);
+    this->actor.flags &= ~1;
+    func_80C25D40(this);
+}
 
-GLOBAL_ASM("asm/non_matchings/ovl_En_Rsn_0x80C25D40/func_80C25EF0.asm")
+void EnRsn_Destroy(Actor* thisx, GlobalContext* globalCtx) {
+    EnRsn* this = THIS;
 
-GLOBAL_ASM("asm/non_matchings/ovl_En_Rsn_0x80C25D40/EnRsn_Draw.asm")
+    SkelAnime_Free(&this->skelAnime, globalCtx);
+}
+
+void EnRsn_Update(Actor* thisx, GlobalContext* globalCtx) {
+    EnRsn* this = THIS;
+
+    this->actionFunc(this, globalCtx);
+    Actor_SetVelocityAndMoveYRotationAndGravity(&this->actor);
+    SkelAnime_FrameUpdateMatrix(&this->skelAnime);
+    func_800E9250(globalCtx, &this->actor, &this->unk1D8, &this->unk1DE, this->actor.topPosRot.pos);
+}
+
+s32 EnRsn_OverrideLimbDraw(GlobalContext* globalCtx, s32 limbIndex, Gfx** dList, Vec3f* pos, Vec3s* rot, Actor* thisx) {
+    EnRsn* this = THIS;
+
+    if (limbIndex == 14) {
+        SysMatrix_InsertXRotation_s(this->unk1D8.y, 1);
+    }
+    return 0;
+}
+
+static Vec3f D_80C26028 = { 0.0f, 0.0f, 0.0f };
+
+void EnRsn_PostLimbDraw(GlobalContext* globalCtx, s32 limbIndex, Gfx** dList, Vec3s* rot, Actor* thisx) {
+    EnRsn* this = THIS;
+    Vec3f sp18 = D_80C26028;
+
+    if (limbIndex == 14) {
+        SysMatrix_MultiplyVector3fByState(&sp18, &this->actor.topPosRot);
+    }
+}
+
+void EnRsn_Draw(Actor* thisx, GlobalContext* globalCtx) {
+    EnRsn* this = THIS;
+    OPEN_DISPS(globalCtx->state.gfxCtx);
+    func_8012C5B0(globalCtx->state.gfxCtx);
+    if (1) { // debug define?
+        s32 pad;
+        gSPSegment(oGfxCtx->polyOpa.p++, 0x08, Lib_PtrSegToVirt(D_06005458));
+        SkelAnime_DrawSV(globalCtx, this->skelAnime.skeleton, this->skelAnime.limbDrawTbl, this->skelAnime.dListCount,
+                         EnRsn_OverrideLimbDraw, EnRsn_PostLimbDraw, &this->actor);
+    }
+    CLOSE_DISPS(globalCtx->state.gfxCtx);
+}
diff --git a/src/overlays/actors/ovl_En_Rsn/z_en_rsn.h b/src/overlays/actors/ovl_En_Rsn/z_en_rsn.h
index 9e9e8f09d6..b41b83383f 100644
--- a/src/overlays/actors/ovl_En_Rsn/z_en_rsn.h
+++ b/src/overlays/actors/ovl_En_Rsn/z_en_rsn.h
@@ -5,9 +5,15 @@
 
 struct EnRsn;
 
+typedef void (*EnRsnActionFunc)(struct BgHakaCurtain*, GlobalContext*);
+
 typedef struct EnRsn {
     /* 0x000 */ Actor actor;
-    /* 0x144 */ char unk_144[0xA0];
+    /* 0x144 */ char unk144[0x4C];
+    /* 0x190 */ SkelAnime skelAnime;
+    /* 0x1D4 */ EnRsnActionFunc actionFunc;
+    /* 0x1D8 */ Vec3s unk1D8;
+    /* 0x1DE */ Vec3s unk1DE;
 } EnRsn; // size = 0x1E4
 
 extern const ActorInit En_Rsn_InitVars;
diff --git a/tables/files_with_nonmatching.txt b/tables/files_with_nonmatching.txt
index 967685dbd9..916b5114f1 100644
--- a/tables/files_with_nonmatching.txt
+++ b/tables/files_with_nonmatching.txt
@@ -590,3 +590,4 @@ ovl_En_Invisible_Ruppe_0x80C258A0
 ovl_Obj_Ending_0x80C25BC0
 ovl_En_Rsn_0x80C25D40
 z_skelanime
+z_collision_check
diff --git a/tables/functions.txt b/tables/functions.txt
index b31bd721ad..3866e0016b 100644
--- a/tables/functions.txt
+++ b/tables/functions.txt
@@ -17091,7 +17091,7 @@
     0x80C25D94:("EnRsn_Init",),
     0x80C25E14:("EnRsn_Destroy",),
     0x80C25E38:("EnRsn_Update",),
-    0x80C25EB0:("func_80C25EB0",),
-    0x80C25EF0:("func_80C25EF0",),
+    0x80C25EB0:("EnRsn_OverrideLimbDraw",),
+    0x80C25EF0:("EnRsn_PostLimbDraw",),
     0x80C25F4C:("EnRsn_Draw",),
 }