diff --git a/source/blood/CMakeLists.txt b/source/blood/CMakeLists.txt
index fd6019799..62ec5ea44 100644
--- a/source/blood/CMakeLists.txt
+++ b/source/blood/CMakeLists.txt
@@ -57,7 +57,6 @@ set( PCH_SOURCES
 	src/player.cpp
 	src/qav.cpp
 	src/replace.cpp
-	src/resource.cpp
 	src/screen.cpp
 	src/sectorfx.cpp
 	src/seq.cpp
diff --git a/source/blood/src/blood.cpp b/source/blood/src/blood.cpp
index 6bcef018b..42358e57b 100644
--- a/source/blood/src/blood.cpp
+++ b/source/blood/src/blood.cpp
@@ -1061,9 +1061,6 @@ int GameInterface::app_main()
 	gGameOptions.nMonsterSettings = !userConfig.nomonsters;
 	bQuickStart = userConfig.nologo;
     ReadAllRFS();
-#ifdef USE_QHEAP
-    Resource::heap = new QHeap(nMaxAlloc);
-#endif
 
     HookReplaceFunctions();
 
diff --git a/source/blood/src/choke.cpp b/source/blood/src/choke.cpp
index 7c1a1c1bf..574a1d45d 100644
--- a/source/blood/src/choke.cpp
+++ b/source/blood/src/choke.cpp
@@ -39,12 +39,11 @@ void CChoke::sub_83ff0(int a1, void(*a2)(PLAYER*))
 {
     at0 = NULL;
     at1c = a2;
-    if (!at4 && a1 != -1)
+    if (!at8 && a1 != -1)
     {
-        at4 = gSysRes.Lookup(a1, "QAV");
-        if (!at4)
+        at8 = getQAV(a1);
+        if (!at8)
             ThrowError("Could not load QAV %d\n", a1);
-        at8 = (QAV*)gSysRes.Lock(at4);
         at8->nSprite = -1;
         at8->x = at14;
         at8->y = at18;
@@ -55,7 +54,7 @@ void CChoke::sub_83ff0(int a1, void(*a2)(PLAYER*))
 
 void CChoke::sub_84110(int x, int y)
 {
-    if (!at4)
+    if (!at8)
         return;
     ClockTicks v4 = gFrameClock;
     gFrameClock = totalclock;
diff --git a/source/blood/src/choke.h b/source/blood/src/choke.h
index edb5d7f64..f72d253b7 100644
--- a/source/blood/src/choke.h
+++ b/source/blood/src/choke.h
@@ -34,7 +34,6 @@ public:
     CChoke()
     {
         at0 = NULL;
-        at4 = NULL;
         at8 = NULL;
         atc = 0;
         at10 = 0;
@@ -46,7 +45,6 @@ public:
     void sub_84110(int x, int y);
     void sub_84218();
     char *at0;
-    DICTNODE *at4;
     QAV *at8;
     int atc;
     int at10;
diff --git a/source/blood/src/fire.cpp b/source/blood/src/fire.cpp
index 904da6bbf..2d5400df4 100644
--- a/source/blood/src/fire.cpp
+++ b/source/blood/src/fire.cpp
@@ -44,7 +44,7 @@ void CellularFrame(char *pFrame, int sizeX, int sizeY);
 
 char FrameBuffer[17280];
 char SeedBuffer[16][128];
-char *gCLU;
+static TArray<uint8_t> gCLU;
 
 void InitSeedBuffers(void)
 {
@@ -89,10 +89,10 @@ void FireInit(void)
     memset(FrameBuffer, 0, sizeof(FrameBuffer));
     BuildCoolTable();
     InitSeedBuffers();
-    DICTNODE *pNode = gSysRes.Lookup("RFIRE", "CLU");
-    if (!pNode)
+    auto fr = fileSystem.OpenFileReader("rfire.clu");
+    if (!fr.isOpen())
         ThrowError("RFIRE.CLU not found");
-    gCLU = (char*)gSysRes.Lock(pNode);
+    gCLU = fr.Read();
     for (int i = 0; i < 100; i++)
         DoFireFrame();
 }
diff --git a/source/blood/src/globals.cpp b/source/blood/src/globals.cpp
index b1bebaa11..b2b96fcfe 100644
--- a/source/blood/src/globals.cpp
+++ b/source/blood/src/globals.cpp
@@ -39,8 +39,6 @@ int gFrame;
 //int volatile gGameClock;
 int gFrameRate;
 
-Resource& gSysRes = fileSystem;
-
 static const char *_module;
 static int _line;
 
diff --git a/source/blood/src/globals.h b/source/blood/src/globals.h
index 446faef73..c58f04b77 100644
--- a/source/blood/src/globals.h
+++ b/source/blood/src/globals.h
@@ -35,6 +35,4 @@ extern int gFrame;
 extern int gFrameRate;
 extern bool bVanilla;
 
-extern FileSystem &gSysRes;
-
 END_BLD_NS
diff --git a/source/blood/src/nnexts.cpp b/source/blood/src/nnexts.cpp
index 8b38ff244..116091e89 100644
--- a/source/blood/src/nnexts.cpp
+++ b/source/blood/src/nnexts.cpp
@@ -4741,11 +4741,9 @@ void usePictureChanger(XSPRITE* pXSource, int objType, int objIndex) {
 
 // player related
 QAV* playerQavSceneLoad(int qavId) {
-    QAV* pQav = NULL; DICTNODE* hQav = gSysRes.Lookup(qavId, "QAV");
-
-    if (hQav) pQav = (QAV*)gSysRes.Lock(hQav);
-    else viewSetSystemMessage("Failed to load QAV animation #%d", qavId);
+    QAV* pQav = getQAV(qavId);
 
+    if (!pQav) viewSetSystemMessage("Failed to load QAV animation #%d", qavId);
     return pQav;
 }
 
diff --git a/source/blood/src/qav.cpp b/source/blood/src/qav.cpp
index f85ead901..d45ec2401 100644
--- a/source/blood/src/qav.cpp
+++ b/source/blood/src/qav.cpp
@@ -155,4 +155,61 @@ void QAV::Precache(void)
         }
     }
 }
+
+
+void ByteSwapQAV(void* p)
+{
+#if B_BIG_ENDIAN == 1
+    QAV* qav = (QAV*)p;
+    qav->nFrames = B_LITTLE32(qav->nFrames);
+    qav->ticksPerFrame = B_LITTLE32(qav->ticksPerFrame);
+    qav->at10 = B_LITTLE32(qav->at10);
+    qav->x = B_LITTLE32(qav->x);
+    qav->y = B_LITTLE32(qav->y);
+    qav->nSprite = B_LITTLE32(qav->nSprite);
+    for (int i = 0; i < qav->nFrames; i++)
+    {
+        FRAMEINFO* pFrame = &qav->frames[i];
+        SOUNDINFO* pSound = &pFrame->sound;
+        pFrame->nCallbackId = B_LITTLE32(pFrame->nCallbackId);
+        pSound->sound = B_LITTLE32(pSound->sound);
+        for (int j = 0; j < 8; j++)
+        {
+            TILE_FRAME* pTile = &pFrame->tiles[j];
+            pTile->picnum = B_LITTLE32(pTile->picnum);
+            pTile->x = B_LITTLE32(pTile->x);
+            pTile->y = B_LITTLE32(pTile->y);
+            pTile->z = B_LITTLE32(pTile->z);
+            pTile->stat = B_LITTLE32(pTile->stat);
+            pTile->angle = B_LITTLE16(pTile->angle);
+        }
+    }
+#endif
+}
+
+
+// This is to eliminate a huge design issue in NBlood that was apparently copied verbatim from the DOS-Version.
+// Sequences were cached in the resource and directly returned from there in writable form, with byte swapping directly performed in the cache on Big Endian systems.
+// To avoid such unsafe operations this caches the read data separately.
+extern FMemArena seqcache; // Use the same storage as the SEQs.
+static TMap<int, QAV*> sequences;
+QAV* getQAV(int res_id)
+{
+    auto p = sequences.CheckKey(res_id);
+    if (p != nullptr) return *p;
+
+    int index = fileSystem.FindResource(res_id, "QAV");
+    if (index < 0)
+    {
+        return nullptr;
+    }
+    auto fr = fileSystem.OpenFileReader(index);
+    auto qavdata = (QAV*)seqcache.Alloc(fr.GetLength());
+    fr.Read(qavdata, fr.GetLength());
+    sequences.Insert(res_id, qavdata);
+    ByteSwapQAV(qavdata);
+    return qavdata;
+}
+
+
 END_BLD_NS
diff --git a/source/blood/src/qav.h b/source/blood/src/qav.h
index 3d08430c7..a6efd46f0 100644
--- a/source/blood/src/qav.h
+++ b/source/blood/src/qav.h
@@ -91,5 +91,6 @@ struct QAV
 #pragma pack(pop)
 
 int qavRegisterClient(void(*pClient)(int, void *));
+QAV* getQAV(int res_id);
 
 END_BLD_NS
diff --git a/source/blood/src/replace.cpp b/source/blood/src/replace.cpp
index 7e0f58651..ff9951005 100644
--- a/source/blood/src/replace.cpp
+++ b/source/blood/src/replace.cpp
@@ -95,7 +95,6 @@ void HookReplaceFunctions(void)
     deletesprite_replace = qdeletesprite;
     changespritesect_replace = qchangespritesect;
     changespritestat_replace = qchangespritestat;
-    loadvoxel_replace = qloadvoxel;
     loadboard_replace = qloadboard;
 }
 
diff --git a/source/blood/src/resource.cpp b/source/blood/src/resource.cpp
deleted file mode 100644
index 23e7cab56..000000000
--- a/source/blood/src/resource.cpp
+++ /dev/null
@@ -1,89 +0,0 @@
-//-------------------------------------------------------------------------
-/*
-Copyright (C) 2010-2019 EDuke32 developers and contributors
-Copyright (C) 2019 Nuke.YKT
-
-This file is part of NBlood.
-
-NBlood is free software; you can redistribute it and/or
-modify it under the terms of the GNU General Public License version 2
-as published by the Free Software Foundation.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
-
-See the GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program; if not, write to the Free Software
-Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
-*/
-//-------------------------------------------------------------------------
-#include "ns.h"	// Must come before everything else!
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <ctype.h>
-#include "compat.h"
-
-#include "common_game.h"
-
-#include "misc.h"
-
-#if B_BIG_ENDIAN == 1
-#include "qav.h"
-#include "seq.h"
-#include "sound.h"
-#endif
-
-BEGIN_BLD_NS
-
-
-
-// Code left here for documentation. 
-// It's unlikely to be needed by today's systems so unless needed I rather leave such hacks out of the file system.
-#if B_BIG_ENDIAN == 1
-void ByteSwapQAV(void *p)
-{
-	QAV *qav = (QAV*)p;
-	qav->nFrames = B_LITTLE32(qav->nFrames);
-	qav->ticksPerFrame = B_LITTLE32(qav->ticksPerFrame);
-	qav->at10 = B_LITTLE32(qav->at10);
-	qav->x = B_LITTLE32(qav->x);
-	qav->y = B_LITTLE32(qav->y);
-	qav->nSprite = B_LITTLE32(qav->nSprite);
-	for (int i = 0; i < qav->nFrames; i++)
-	{
-		FRAMEINFO *pFrame = &qav->frames[i];
-		SOUNDINFO *pSound = &pFrame->sound;
-		pFrame->nCallbackId = B_LITTLE32(pFrame->nCallbackId);
-		pSound->sound = B_LITTLE32(pSound->sound);
-		for (int j = 0; j < 8; j++)
-		{
-			TILE_FRAME *pTile = &pFrame->tiles[j];
-			pTile->picnum = B_LITTLE32(pTile->picnum);
-			pTile->x = B_LITTLE32(pTile->x);
-			pTile->y = B_LITTLE32(pTile->y);
-			pTile->z = B_LITTLE32(pTile->z);
-			pTile->stat = B_LITTLE32(pTile->stat);
-			pTile->angle = B_LITTLE16(pTile->angle);
-		}
-	}
-}
-
-void ByteSwapSFX(void *p)
-{
-	SFX *pSFX = (SFX*)p;
-	pSFX->relVol = B_LITTLE32(pSFX->relVol);
-	pSFX->pitch = B_LITTLE32(pSFX->pitch);
-	pSFX->pitchRange = B_LITTLE32(pSFX->pitchRange);
-	pSFX->format = B_LITTLE32(pSFX->format);
-	pSFX->loopStart = B_LITTLE32(pSFX->loopStart);
-}
-
-#endif
-
-
-END_BLD_NS
diff --git a/source/blood/src/seq.cpp b/source/blood/src/seq.cpp
index b9b19e726..15d9824f8 100644
--- a/source/blood/src/seq.cpp
+++ b/source/blood/src/seq.cpp
@@ -603,6 +603,7 @@ void SeqLoadSaveConstruct(void)
 
 static void ByteSwapSEQ(Seq* pSeq)
 {
+#if B_BIG_ENDIAN == 1
     pSeq->version = B_LITTLE16(pSeq->version);
     pSeq->nFrames = B_LITTLE16(pSeq->nFrames);
     pSeq->at8 = B_LITTLE16(pSeq->at8);
@@ -636,6 +637,7 @@ static void ByteSwapSEQ(Seq* pSeq)
         swapFrame.reserved = bitReader.readUnsigned(2);
         *pFrame = swapFrame;
     }
+#endif
 }
 
 
diff --git a/source/blood/src/sound.cpp b/source/blood/src/sound.cpp
index 33c63e6d3..a97cbc01f 100644
--- a/source/blood/src/sound.cpp
+++ b/source/blood/src/sound.cpp
@@ -52,6 +52,17 @@ int soundRates[13] = {
 #define kChannelMax 32
 
 
+void ByteSwapSFX(SFX* pSFX)
+{
+#if B_BIG_ENDIAN == 1
+    pSFX->relVol = B_LITTLE32(pSFX->relVol);
+    pSFX->pitch = B_LITTLE32(pSFX->pitch);
+    pSFX->pitchRange = B_LITTLE32(pSFX->pitchRange);
+    pSFX->format = B_LITTLE32(pSFX->format);
+    pSFX->loopStart = B_LITTLE32(pSFX->loopStart);
+#endif
+}
+
 //==========================================================================
 //
 // S_AddBloodSFX
@@ -64,7 +75,8 @@ int soundRates[13] = {
 static void S_AddBloodSFX(int lumpnum)
 {
     auto sfxlump = fileSystem.ReadFile(lumpnum);
-    const SFX* sfx = (SFX*)sfxlump.GetMem();
+    SFX* sfx = (SFX*)sfxlump.GetMem();
+    ByteSwapSFX(sfx);
     FStringf rawname("%s.raw", sfx->rawName);
     auto rawlump = fileSystem.FindFile(rawname);
     int sfxnum;
diff --git a/source/blood/src/tile.cpp b/source/blood/src/tile.cpp
index ba428eb93..e1e1d9cdb 100644
--- a/source/blood/src/tile.cpp
+++ b/source/blood/src/tile.cpp
@@ -38,30 +38,6 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
 BEGIN_BLD_NS
 
-void qloadvoxel(int32_t nVoxel)
-{
-    static int nLastVoxel = 0;
-    DICTNODE *hVox = gSysRes.Lookup(nVoxel, "KVX");
-    if (!hVox) {
-        Printf("Missing voxel #%d (max voxels: %d)", nVoxel, kMaxVoxels);
-        return;
-    }
-
-    if (!hVox->LockCount())
-        voxoff[nLastVoxel][0] = 0;
-    nLastVoxel = nVoxel;
-    char *pVox = (char*)gSysRes.Lock(hVox);
-    for (int i = 0; i < MAXVOXMIPS; i++)
-    {
-        int nSize = *((int*)pVox);
-#if B_BIG_ENDIAN == 1
-        nSize = B_LITTLE32(nSize);
-#endif
-        pVox += 4;
-        voxoff[nVoxel][i] = (intptr_t)pVox;
-        pVox += nSize;
-    }
-}
 
 bool artLoaded = false;
 int nTileFiles = 0;
@@ -128,11 +104,12 @@ void tileProcessGLVoxels(void)
     voxInit = true;
     for (int i = 0; i < kMaxVoxels; i++)
     {
-        DICTNODE *hVox = gSysRes.Lookup(i, "KVX");
-        if (!hVox)
-            continue;
-        char *pVox = (char*)gSysRes.Load(hVox);
-        voxmodels[i] = loadkvxfrombuf(pVox, hVox->Size());
+        auto index = fileSystem.FindResource(i, "KVX");
+        if (index >= 0)
+        {
+            auto data = fileSystem.ReadFile(index);
+            voxmodels[i] = loadkvxfrombuf((const char*)data.GetMem(), data.GetSize());
+        }
     }
 }
 #endif
@@ -175,8 +152,6 @@ void tilePreloadTile(int nTile)
             voxelIndex[nTile] = -1;
             picanm[nTile].extra &= ~7;
         }
-        else
-            qloadvoxel(voxelIndex[nTile]);
         break;
     }
     while(n--)
diff --git a/source/blood/src/tile.h b/source/blood/src/tile.h
index 9d9fed6c0..1193ef5fc 100644
--- a/source/blood/src/tile.h
+++ b/source/blood/src/tile.h
@@ -53,7 +53,6 @@ extern short voxelIndex[kMaxTiles];
 extern int nPrecacheCount;
 extern char precachehightile[2][(MAXTILES+7)>>3];
 
-void qloadvoxel(int32_t nVoxel);
 int tileInit(char a1, const char *a2);
 #ifdef USE_OPENGL
 void tileProcessGLVoxels(void);
diff --git a/source/blood/src/view.cpp b/source/blood/src/view.cpp
index 744c3bd1f..1ee3348fa 100644
--- a/source/blood/src/view.cpp
+++ b/source/blood/src/view.cpp
@@ -2398,8 +2398,6 @@ void viewProcessSprites(int32_t cX, int32_t cY, int32_t cZ, int32_t cA, int32_t
                         pTSprite->cstat &= ~(4|8);
                         pTSprite->yoffset += tileTopOffset(pTSprite->picnum);
                         pTSprite->picnum = voxelIndex[pTSprite->picnum];
-                        if (!voxoff[pTSprite->picnum])
-                            qloadvoxel(pTSprite->picnum);
                         if ((picanm[nTile].extra&7) == 7)
                         {
                             pTSprite->ang = ((int)totalclock<<3)&2047;
diff --git a/source/blood/src/weapon.cpp b/source/blood/src/weapon.cpp
index e6ef41b01..00cf83b29 100644
--- a/source/blood/src/weapon.cpp
+++ b/source/blood/src/weapon.cpp
@@ -218,10 +218,9 @@ void WeaponInit(void)
 {
     for (int i = 0; i < kQAVEnd; i++)
     {
-        DICTNODE *hRes = gSysRes.Lookup(i, "QAV");
-        if (!hRes)
+        weaponQAV[i] = getQAV(i);
+        if (!weaponQAV[i])
             ThrowError("Could not load QAV %d\n", i);
-        weaponQAV[i] = (QAV*)gSysRes.Lock(hRes);
         weaponQAV[i]->nSprite = -1;
     }
 }
diff --git a/source/build/include/build.h b/source/build/include/build.h
index 89a38e1f7..6845964e8 100644
--- a/source/build/include/build.h
+++ b/source/build/include/build.h
@@ -992,7 +992,6 @@ int32_t md_setmisc(int32_t modelid, float scale, int32_t shadeoff, float zadd, f
 extern TArray<FString> g_clipMapFiles;
 
 EXTERN int32_t nextvoxid;
-EXTERN intptr_t voxoff[MAXVOXELS][MAXVOXMIPS]; // used in KenBuild
 EXTERN int8_t voxreserve[(MAXVOXELS+7)>>3];
 EXTERN int8_t voxrotate[(MAXVOXELS+7)>>3];
 
@@ -1139,7 +1138,6 @@ extern int32_t(*insertsprite_replace)(int16_t sectnum, int16_t statnum);
 extern int32_t(*deletesprite_replace)(int16_t spritenum);
 extern int32_t(*changespritesect_replace)(int16_t spritenum, int16_t newsectnum);
 extern int32_t(*changespritestat_replace)(int16_t spritenum, int16_t newstatnum);
-extern void(*loadvoxel_replace)(int32_t voxel);
 extern int32_t(*loadboard_replace)(const char *filename, char flags, vec3_t *dapos, int16_t *daang, int16_t *dacursectnum);
 #ifdef USE_OPENGL
 extern void(*PolymostProcessVoxels_Callback)(void);
diff --git a/source/build/src/engine.cpp b/source/build/src/engine.cpp
index a30a9e2e7..b0e5e16fd 100644
--- a/source/build/src/engine.cpp
+++ b/source/build/src/engine.cpp
@@ -58,7 +58,6 @@ int16_t pskybits_override = -1;
 // This was on the cache but is permanently allocated, so put it into something static. This needs some rethinking anyway
 static TArray<TArray<uint8_t>> voxelmemory;
 
-void (*loadvoxel_replace)(int32_t voxindex) = NULL;
 int16_t tiletovox[MAXTILES];
 #ifdef USE_OPENGL
 char *voxfilenames[MAXVOXELS];
@@ -3030,7 +3029,6 @@ int32_t qloadkvx(int32_t voxindex, const char *filename)
 
 		voxelmemory.Reserve(1);
 		voxelmemory.Last() = fil.Read(dasiz);
-		voxoff[voxindex][i] = (intptr_t)voxelmemory.Last().Data();
 
         lengcnt += dasiz+4;
         if (lengcnt >= lengtot-768)
@@ -3069,11 +3067,6 @@ void vox_undefine(int32_t const tile)
     DO_FREE_AND_NULL(voxfilenames[voxindex]);
 #endif
 
-    for (ssize_t j = 0; j < MAXVOXMIPS; ++j)
-    {
-        // CACHE1D_FREE
-        voxoff[voxindex][j] = 0;
-    }
     voxscale[voxindex] = 65536;
     voxrotate[voxindex>>3] &= ~pow2char[voxindex&7];
     tiletovox[tile] = -1;
diff --git a/source/common/filesystem/filesystem.cpp b/source/common/filesystem/filesystem.cpp
index d411ab32f..0fdfcf4f6 100644
--- a/source/common/filesystem/filesystem.cpp
+++ b/source/common/filesystem/filesystem.cpp
@@ -1637,12 +1637,6 @@ FResourceLump *FileSystem::Lookup(const char *name, const char *type)
 	else return nullptr;
 }
 
-FResourceLump *FileSystem::Lookup(unsigned int id, const char *type)
-{
-	auto lump = FindResource(id, type);
-	if (lump >= 0) return FileInfo[lump].lump;
-	else return nullptr;
-}
 FResourceLump* FileSystem::GetFileAt(int no)
 {
 	return FileInfo[no].lump;
diff --git a/source/common/filesystem/filesystem.h b/source/common/filesystem/filesystem.h
index a7c38683f..e8197258a 100644
--- a/source/common/filesystem/filesystem.h
+++ b/source/common/filesystem/filesystem.h
@@ -190,8 +190,7 @@ public:
 
 	// Blood stuff
 	FResourceLump* Lookup(const char* name, const char* type);
-	FResourceLump* Lookup(unsigned int id, const char* type);
-
+	
 	FResourceLump* GetFileAt(int no);
 
 	const void* Lock(int lump);