Anti-cheat off, weapon sets 6-7 in hero files

- The game's cheater detection killed the hero ("Hase!") whenever its
  protected stat mirror was stale; the mirror is now refreshed from the hero
  whenever it is unlocked, stream checks never punish, loadHero no longer
  sets the cheater flag (docs/anticheat.md).
- saveHero wrote the items of weapon sets 1-5 only: its loop runs over all 7
  sets, so sets 6-7 survive a world loading the hero from the hero file.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/mods/anticheat.cpp

@@ -0,0 +1,109 @@
+// The game's anti-cheat is off (request of 2026-10-25, after the Gladiator
+// "randomly exploded" fighting a dragon on Silber).
+//
+// Measured: the game keeps a mirror of the local hero's attribute / skill
+// fields on a protected page (pointers 0x182cddc and 0x182cde0, see
+// RefreshMirror). Checks compare the hero with it - cCreature::Think about once
+// in 101 ticks (0x5389be), VerifyHeroMirror 0x5905f0 (4 callers) and inline
+// copies at 0x4659f6, 0x564c6f, 0x57e09c, 0x585bd0, 0x619d33 - reset every
+// mismatching field (attributes to 1, skill levels to 0), and on any mismatch
+// kill the hero ("*** Cheater detected! *** Hase!") and set the cheater flag
+// 0x182cdd0, saved in the hero file (record +0xf3). The log showed the hero at
+// full health dying with every skill level mismatching: the mirror was stale
+// (any change the game does not route through its own mirror writers, e.g.
+// loading the shared hero into another world, leaves it behind).
+//
+// The mod: every check and every mirror writer starts with
+// VirtualProtect(mirror, 0x1000, PAGE_READWRITE); at that moment the mirror is
+// refreshed from the hero, so checks compare the hero with itself and writers
+// overwrite it as before. The stream checks of the quest manager's hero data
+// (a cheat marker 0xfea4fea4 and three stored values) never punish, and loading
+// a hero file no longer sets the cheater flag.
+
+#include <windows.h>
+
+#include <cstdint>
+#include <cstring>
+
+#include "game/engine/objects.h"
+#include "re/hook.h"
+#include "re/log.h"
+#include "re/patch.h"
+
+namespace mods::anticheat {
+namespace {
+
+// Mirror layout (writer 0x603d9c): +0 hero +0x3b4, +4 hero +0x3ee (gold),
+// +8 hero +0x3fe (u16), each xor-ed with the hero's key byte (+0x38) repeated
+// four times; +0xc a copy of hero +0x3b0..+0x49d. The second mirror uses the
+// key shifted left by one.
+constexpr uintptr_t kMirrorPointer = 0x0182cddc;
+constexpr uintptr_t kSecondMirrorPointer = 0x0182cde0;
+constexpr size_t kHeroKey = 0x38;
+constexpr size_t kField0 = 0x3b4;
+constexpr size_t kGold = 0x3ee;
+constexpr size_t kField2 = 0x3fe;  // u16
+constexpr size_t kCopyStart = 0x3b0;
+constexpr size_t kCopySize = 0x3b * 4 + 2;  // rep movsd 0x3b + movsw
+constexpr size_t kMirrorCopy = 0xc;
+constexpr size_t kPageSize = 0x1000;
+
+uint32_t U32(const uint8_t* p) {
+    uint32_t v;
+    std::memcpy(&v, p, 4);
+    return v;
+}
+
+void WriteMirror(uint8_t* mirror, const uint8_t* hero, uint32_t key) {
+    const uint32_t values[3] = {U32(hero + kField0) ^ key, U32(hero + kGold) ^ key,
+                                (U32(hero + kField2) & 0xffff) ^ key};
+    std::memcpy(mirror, values, sizeof values);
+    std::memcpy(mirror + kMirrorCopy, hero + kCopyStart, kCopySize);
+}
+
+// The page is writable when this runs (inside VirtualProtect below).
+void RefreshMirror(uint8_t* page) {
+    const auto* hero = static_cast<const uint8_t*>(game::GetPlayerHero());
+    if (!hero) {
+        return;
+    }
+    const uint32_t keyByte = hero[kHeroKey];
+    const uint32_t key = keyByte | keyByte << 8 | keyByte << 16 | keyByte << 24;
+    WriteMirror(page, hero, key);
+    auto* second = *reinterpret_cast<uint8_t**>(kSecondMirrorPointer);
+    if (second >= page && second + kMirrorCopy + kCopySize <= page + kPageSize) {
+        WriteMirror(second, hero, key << 1);
+    }
+}
+
+constexpr re::CodeReplacement kNoStreamPunishment[] = {
+    // cheat marker 0xfea4fea4 read: `jne` past the punishment -> `jmp`
+    {0x00467782, {0x0f, 0x85, 0xbd, 0x01, 0x00, 0x00}, {0xe9, 0xbe, 0x01, 0x00, 0x00, 0x90}, 6},
+    // stored values compared with the hero: `je` past the punishment -> `jmp`
+    {0x0046a60b, {0x74, 0x18}, {0xeb, 0x18}, 2},
+    {0x0046a64e, {0x74, 0x18}, {0xeb, 0x18}, 2},
+    {0x0046a696, {0x74, 0x18}, {0xeb, 0x18}, 2},
+    // loadHero: the hero file's cheater flag (`mov byte [0x182cdd0], 1` -> 0)
+    {0x006066eb, {0xc6, 0x05, 0xd0, 0xcd, 0x82, 0x01, 0x01}, {0xc6, 0x05, 0xd0, 0xcd, 0x82, 0x01, 0x00}, 7},
+};
+
+void Startup() {
+    const int failed = re::ReplaceAll(kNoStreamPunishment);
+    re::Log("anticheat: off (%d patches failed)", failed);
+}
+RE_STARTUP(AntiCheatStartup, Startup);
+
+}  // namespace
+}  // namespace mods::anticheat
+
+BOOL WINAPI VirtualProtectMirrorFresh(LPVOID address, SIZE_T size, DWORD protect, PDWORD old);
+RE_HOOK_API(VirtualProtect, VirtualProtectMirrorFresh);
+
+BOOL WINAPI VirtualProtectMirrorFresh(LPVOID address, SIZE_T size, DWORD protect, PDWORD old) {
+    const BOOL result = VirtualProtectMirrorFresh_original(address, size, protect, old);
+    auto* mirror = *reinterpret_cast<uint8_t**>(mods::anticheat::kMirrorPointer);
+    if (result && protect == PAGE_READWRITE && mirror && address == mirror) {
+        mods::anticheat::RefreshMirror(mirror);
+    }
+    return result;
+}

src/mods/inventory_save.cpp

@@ -32,6 +32,7 @@
 #include "mods/sharedchest.h"
 #include "mods/skillslots.h"
 #include "re/hook.h"
+#include "re/patch.h"
 #include "re/log.h"
 
 namespace mods::inventory_save {
@@ -327,6 +328,20 @@ void RegisterHeroData(const char* key, HeroDataWriteFn write, HeroDataReadFn rea
     HeroDataList().push_back({key, write, read});
 }
 
+// saveHero writes the hero's items (chunk 0xc2) from its inventories, equipment
+// and weapon sets; the weapon-set loop (GetWeaponSetItem over sets 0..4, `cmp
+// esi, 5`) runs over all 7 so the items of sets 6-7 are in hero files too. Without
+// them a world loading the hero from its hero file had sets 6-7 pointing at
+// items that did not exist (2026-10-25).
+constexpr uint32_t kSaveHeroWeaponSetLoop = 0x00605046;
+
+void Startup() {
+    if (!re::PatchInstructionByte(kSaveHeroWeaponSetLoop, 2, kGameSlots, kSlots)) {
+        re::Log("inventory: saveHero weapon-set loop not patched");
+    }
+}
+RE_STARTUP(InventorySaveStartup, Startup);
+
 } // namespace mods::inventory_save
 
 namespace game {