diff --git a/BH/BH.cpp b/BH/BH.cpp
index 984d385b..e0422fa8 100644
--- a/BH/BH.cpp
+++ b/BH/BH.cpp
@@ -268,6 +268,9 @@ void BH::CheckForPD2()
 	{
 		FARPROC proc = GetProcAddress(pd2Handle, "_D2Client_PlaySoundWithCustomVolumeOrPriority@20");
 		App.pd2.pd2PlaySoundImpl = proc ? (pd2PlaySoundImpl_t)proc : NULL;
+
+		proc = GetProcAddress(pd2Handle, "_D2Client_GetItemDiscoveryState@12");
+		App.pd2.pd2GetItemDiscoveryStateImpl = proc ? (pd2GetItemDiscoveryStateImpl_t)proc : NULL;
 	}
 }
 
diff --git a/BH/BH.h b/BH/BH.h
index ecf3cb63..3cff17bc 100644
--- a/BH/BH.h
+++ b/BH/BH.h
@@ -45,6 +45,7 @@ namespace BH
 };
 
 typedef BOOL(__stdcall* pd2PlaySoundImpl_t)(UnitAny* pUnit, int nSound, int nVolume, int nPriority, BOOL bDropSound);
+typedef DWORD(__stdcall* pd2GetItemDiscoveryStateImpl_t)(DWORD dwFileIndex, DWORD dwQuality, DWORD dwBaseId);
 
 struct BHApp
 {
@@ -187,6 +188,7 @@ struct BHApp
 	struct
 	{
 		pd2PlaySoundImpl_t pd2PlaySoundImpl = NULL;
+		pd2GetItemDiscoveryStateImpl_t pd2GetItemDiscoveryStateImpl = NULL;
 	} pd2;
 
 	std::vector<Toggle*> hotkeyToggles;
diff --git a/BH/Modules/Item/ItemDisplay.cpp b/BH/Modules/Item/ItemDisplay.cpp
index e0c12198..ec79cc71 100644
--- a/BH/Modules/Item/ItemDisplay.cpp
+++ b/BH/Modules/Item/ItemDisplay.cpp
@@ -562,6 +562,10 @@ enum FilterCondition
 	COND_UPSTAT,
 	COND_MAXSOCKETS,
 	COND_FORMULA,
+	COND_ANYDISCOVERED,
+	COND_ALLDISCOVERED,
+	COND_ANYOWNED,
+	COND_ALLOWNED,
 
 	COND_NULL
 };
@@ -751,6 +755,10 @@ std::map<std::wstring, FilterCondition> condition_map =
 	{L"WIDTH", COND_WIDTH},
 	{L"HEIGHT", COND_HEIGHT},
 	{L"AREA", COND_AREA},
+	{L"ANYDISCOVERED", COND_ANYDISCOVERED},
+	{L"ALLDISCOVERED", COND_ALLDISCOVERED},
+	{L"ANYOWNED", COND_ANYOWNED},
+	{L"ALLOWNED", COND_ALLOWNED},
 	// These have a number as part of the key, handled separately
 	//{"SK", COND_SK},
 	//{"OS", COND_OS},
@@ -3997,6 +4005,18 @@ void Condition::BuildConditions(vector<Condition*>& conditions,
 	case COND_ID:
 		Condition::AddOperand(conditions, new FlagsCondition(ITEM_IDENTIFIED));
 		break;
+	case COND_ANYDISCOVERED:
+		Condition::AddOperand(conditions, new DiscoveryStateCondition(DISCOVERYSTATE_ANYDISCOVERED));
+		break;
+	case COND_ALLDISCOVERED:
+		Condition::AddOperand(conditions, new DiscoveryStateCondition(DISCOVERYSTATE_ALLDISCOVERED));
+		break;
+	case COND_ANYOWNED:
+		Condition::AddOperand(conditions, new DiscoveryStateCondition(DISCOVERYSTATE_ANYOWNED));
+		break;
+	case COND_ALLOWNED:
+		Condition::AddOperand(conditions, new DiscoveryStateCondition(DISCOVERYSTATE_ALLOWNED));
+		break;
 	case COND_ILVL:
 		Condition::AddOperand(conditions, new ItemLevelCondition(operation, value, value2));
 		break;
@@ -4535,6 +4555,26 @@ bool QualityCondition::EvaluateInternal(UnitItemInfo* uInfo,
 	return (uInfo->item->pItemData->dwQuality == quality);
 }
 
+bool DiscoveryStateCondition::EvaluateInternal(UnitItemInfo* uInfo,
+	Condition* arg1,
+	Condition* arg2) {
+	if (!uInfo->item || !uInfo->item->pItemData)
+	{
+		return false;
+	}
+	// Backed by the ProjectDiablo.dll discovery export (resolved in
+	// BH::CheckForPD2); the conditions evaluate to false when
+	// ProjectDiablo.dll is absent.
+	if (!App.pd2.pd2GetItemDiscoveryStateImpl) { return false; }
+	ItemData* pItemData = uInfo->item->pItemData;
+	// Unidentified unique/set drops have no file index client-side; pass the
+	// unset sentinel so the dll covers "all the variants it could be" via
+	// the base item's code.
+	DWORD dwFileIndex = (pItemData->dwFlags & ITEM_IDENTIFIED) ? pItemData->dwFileIndex : 0xFFFFFFFF;
+	DWORD dwState = App.pd2.pd2GetItemDiscoveryStateImpl(dwFileIndex, pItemData->dwQuality, uInfo->item->dwTxtFileNo);
+	return (dwState & discoveryFlag) > 0;
+}
+
 bool NonMagicalCondition::EvaluateInternal(UnitItemInfo* uInfo,
 	Condition* arg1,
 	Condition* arg2)
diff --git a/BH/Modules/Item/ItemDisplay.h b/BH/Modules/Item/ItemDisplay.h
index 5fedfba4..d992214f 100644
--- a/BH/Modules/Item/ItemDisplay.h
+++ b/BH/Modules/Item/ItemDisplay.h
@@ -191,6 +191,23 @@ class QualityCondition : public Condition
 		Condition* arg2);
 };
 
+enum DiscoveryStateFlag
+{
+	DISCOVERYSTATE_ANYDISCOVERED = 0x1,	// any candidate variant group discovered (grail bit set)
+	DISCOVERYSTATE_ALLDISCOVERED = 0x2,	// every candidate variant group discovered
+	DISCOVERYSTATE_ANYOWNED = 0x4,		// any candidate variant group owned (stored in compendium)
+	DISCOVERYSTATE_ALLOWNED = 0x8,		// every candidate variant group owned
+};class DiscoveryStateCondition : public Condition
+{
+public:
+	DiscoveryStateCondition(unsigned int flag) : discoveryFlag(flag) { conditionType = CT_Operand; };
+private:
+	unsigned int discoveryFlag;
+	bool         EvaluateInternal(UnitItemInfo* uInfo,
+		Condition* arg1,
+		Condition* arg2);
+};
+
 class NonMagicalCondition : public Condition
 {
 public: