diff --git a/AI/GeniusAI/CGeniusAI.h b/AI/GeniusAI/CGeniusAI.h
index 157a4eec8..4bd09903c 100644
--- a/AI/GeniusAI/CGeniusAI.h
+++ b/AI/GeniusAI/CGeniusAI.h
@@ -181,7 +181,7 @@ public:
 	virtual void heroKilled(const CGHeroInstance *);
 	virtual void heroCreated(const CGHeroInstance *);
 	virtual void heroMoved(const TryMoveHero &);
-	virtual void heroPrimarySkillChanged(const CGHeroInstance * hero, int which, int val) {};
+	virtual void heroPrimarySkillChanged(const CGHeroInstance * hero, int which, si64 val) {};
 	virtual void showSelDialog(std::string text, std::vector<CSelectableComponent*> & components, int askID){};
 	virtual void showBlockingDialog(const std::string &text, const std::vector<Component> &components, ui32 askID, const int soundID, bool selection, bool cancel); //Show a dialog, player must take decision. If selection then he has to choose between one of given components, if cancel he is allowed to not choose. After making choice, CCallback::selectionMade should be called with number of selected component (1 - n) or 0 for cancel (if allowed) and askID.
 	virtual void tileRevealed(int3 pos);
diff --git a/CGameInterface.h b/CGameInterface.h
index 1f6ffd32e..e4baa668d 100644
--- a/CGameInterface.h
+++ b/CGameInterface.h
@@ -78,7 +78,7 @@ public:
 	virtual void heroInGarrisonChange(const CGTownInstance *town){};
 	//virtual void heroKilled(const CGHeroInstance*){};
 	virtual void heroMoved(const TryMoveHero & details){};
-	virtual void heroPrimarySkillChanged(const CGHeroInstance * hero, int which, int val){};
+	virtual void heroPrimarySkillChanged(const CGHeroInstance * hero, int which, si64 val){};
 	virtual void heroManaPointsChanged(const CGHeroInstance * hero){} //not called at the beginning of turn and after spell casts
 	virtual void heroMovePointsChanged(const CGHeroInstance * hero){} //not called at the beginning of turn and after movement
 	virtual void heroVisitsTown(const CGHeroInstance* hero, const CGTownInstance * town){};
diff --git a/client/CPlayerInterface.cpp b/client/CPlayerInterface.cpp
index b304ad924..70639d0bd 100644
--- a/client/CPlayerInterface.cpp
+++ b/client/CPlayerInterface.cpp
@@ -804,7 +804,7 @@ int3 CPlayerInterface::repairScreenPos(int3 pos)
 		pos.y = CGI->mh->map->height - this->adventureInt->terrain.tilesh + CGI->mh->frameH;
 	return pos;
 }
-void CPlayerInterface::heroPrimarySkillChanged(const CGHeroInstance * hero, int which, int val)
+void CPlayerInterface::heroPrimarySkillChanged(const CGHeroInstance * hero, int which, si64 val)
 {
 	if(which >= PRIMARY_SKILLS) //no need to redraw infowin if this is experience (exp is treated as prim skill with id==4)
 		return;
diff --git a/client/CPlayerInterface.h b/client/CPlayerInterface.h
index 782d48019..cc2a20e80 100644
--- a/client/CPlayerInterface.h
+++ b/client/CPlayerInterface.h
@@ -139,7 +139,7 @@ public:
 	void heroGotLevel(const CGHeroInstance *hero, int pskill, std::vector<ui16> &skills, boost::function<void(ui32)> &callback);
 	void heroInGarrisonChange(const CGTownInstance *town);
 	void heroMoved(const TryMoveHero & details);
-	void heroPrimarySkillChanged(const CGHeroInstance * hero, int which, int val);
+	void heroPrimarySkillChanged(const CGHeroInstance * hero, int which, si64 val);
 	void heroManaPointsChanged(const CGHeroInstance * hero);
 	void heroMovePointsChanged(const CGHeroInstance * hero);
 	void heroVisitsTown(const CGHeroInstance* hero, const CGTownInstance * town);
diff --git a/client/Client.h b/client/Client.h
index 698a51f7f..5e54cb2f1 100644
--- a/client/Client.h
+++ b/client/Client.h
@@ -89,7 +89,7 @@ public:
 	void setOwner(int objid, ui8 owner){};
 	void setHoverName(int objid, MetaString * name){};
 	void setObjProperty(int objid, int prop, int val){};
-	void changePrimSkill(int ID, int which, int val, bool abs=false){};
+	void changePrimSkill(int ID, int which, si64 val, bool abs=false){};
 	void changeSecSkill(int ID, int which, int val, bool abs=false){}; 
 	void showInfoDialog(InfoWindow *iw){};
 	void showBlockingDialog(BlockingDialog *iw, const CFunctionList<void(ui32)> &callback){};
diff --git a/hch/CHeroHandler.cpp b/hch/CHeroHandler.cpp
index e0b2f7b13..a6df2131c 100644
--- a/hch/CHeroHandler.cpp
+++ b/hch/CHeroHandler.cpp
@@ -378,27 +378,30 @@ void CHeroHandler::initHeroClasses()
 	loadNativeTerrains();
 }
 
-unsigned int CHeroHandler::level(ui64 experience)
+unsigned int CHeroHandler::level (ui64 experience)
 {
 	int i;
-	if(experience <= expPerLevel.back())
+	if (experience <= expPerLevel.back())
 	{
 		for(i = expPerLevel.size()-1; experience < expPerLevel[i]; i--);
 		return i + 1;
 	}
 	else
 	{
-		for(i = expPerLevel.size(); experience > reqExp(i); i++);
-		return i - 1;
+		//for(i = expPerLevel.size(); experience > reqExp(i); i++);
+		i = expPerLevel.size();
+		while (experience > reqExp (i))
+			i++;
+		return i;
 	}
 }
 
-ui64 CHeroHandler::reqExp(unsigned int level)
+ui64 CHeroHandler::reqExp (unsigned int level)
 {
 	if(!level)
 		return 0;
 
-	if(level<=expPerLevel.size())
+	if(level <= expPerLevel.size())
 	{
 		return expPerLevel[level - 1];
 	}
@@ -412,7 +415,13 @@ ui64 CHeroHandler::reqExp(unsigned int level)
 		//	exp*=1.2;
 		//}
 		//return exp;
-		return (ui64)(reqExp(level - 1) + (reqExp(level - 1) - reqExp(level - 2)) * 1.2); //inefficient but follows exactly H3 values
+		while (level > expPerLevel.size())
+		{
+			int i = expPerLevel.size() - 1;
+			expPerLevel.push_back ((ui64)(expPerLevel[i] + (expPerLevel[i] - expPerLevel[i-1]) * 1.2));
+		}
+		return expPerLevel[level-1];
+		//return (ui64)(reqExp(level - 1) + (reqExp(level - 1) - reqExp(level - 2)) * 1.2); //inefficient but follows exactly H3 values
 	}
 }
 
diff --git a/hch/CObjectHandler.cpp b/hch/CObjectHandler.cpp
index 39ea736af..392bbb56a 100644
--- a/hch/CObjectHandler.cpp
+++ b/hch/CObjectHandler.cpp
@@ -1373,7 +1373,7 @@ void CGVisitableOPH::initObj()
 		ttype = -1;
 }
 
-void CGVisitableOPH::treeSelected( int heroID, int resType, int resVal, int expVal, ui32 result ) const
+void CGVisitableOPH::treeSelected( int heroID, int resType, int resVal, ui64 expVal, ui32 result ) const
 {
 	if(result) //player agreed to give res for exp
 	{
@@ -2781,7 +2781,7 @@ void CGEvent::onHeroVisit( const CGHeroInstance * h ) const
 		activated(h);
 }
 
-void CGEvent::endBattle( const CGHeroInstance *h, BattleResult *result ) const
+void CGPandoraBox::endBattle( const CGHeroInstance *h, BattleResult *result ) const
 {
 	if(result->winner)
 		return;
@@ -2808,7 +2808,49 @@ void CGEvent::activated( const CGHeroInstance * h ) const
 	}
 }
 
-void CGEvent::giveContents( const CGHeroInstance *h, bool afterBattle ) const
+void CGPandoraBox::initObj()
+{
+	blockVisit = true;
+}
+void CGPandoraBox::onHeroVisit(const CGHeroInstance * h) const
+{
+		BlockingDialog bd (true, false);
+		bd.player = h->getOwner();
+		bd.soundID = soundBase::QUEST;
+		bd.text.addTxt (MetaString::ADVOB_TXT, 14);
+		cb->showBlockingDialog (&bd, boost::bind (&CGPandoraBox::open, this, h, _1));	
+}
+void CGPandoraBox::open( const CGHeroInstance * h, ui32 accept ) const
+{
+	if (accept)
+	{
+		if (army)
+		{
+			InfoWindow iw;
+			iw.player = h->tempOwner;
+			iw.text.addTxt(MetaString::ADVOB_TXT, 16);
+			cb->showInfoDialog(&iw);
+			cb->startBattleI(h, this, boost::bind(&CGPandoraBox::endBattle, this, h,_1));
+		}
+		else if (message.size() == resources.size() ==
+				primskills.size() == abilities.size() ==
+				abilityLevels.size() == artifacts.size() ==
+				spells.size() == creatures ==
+				gainedExp == manaDiff == moraleDiff == luckDiff == 0) //yeaha!
+		{
+			InfoWindow iw;
+			iw.player = h->tempOwner;
+			iw.text.addTxt(MetaString::ADVOB_TXT, 15);
+			cb->showInfoDialog(&iw);
+
+		}
+		else
+		{
+			giveContents (h, false);
+		}
+	}
+}
+void CGPandoraBox::giveContents( const CGHeroInstance *h, bool afterBattle ) const
 {
 	InfoWindow iw;
 	iw.player = h->getOwner();
@@ -3011,12 +3053,7 @@ void CGEvent::giveContents( const CGHeroInstance *h, bool afterBattle ) const
 		SetGarrisons sg;
 		sg.garrs[id] = creatures;
 		cb->sendAndApply(&sg);
-
-		if(removeAfterVisit)
-			cb->showGarrisonDialog(id,h->id,boost::bind(&IGameCallback::removeObject,cb,id));
-		else
-			cb->showGarrisonDialog(id,h->id,0);
-		return;
+		cb->showGarrisonDialog(id,h->id,boost::bind(&IGameCallback::removeObject,cb,id));
 	}
 
 	if(!afterBattle && message.size())
@@ -3024,12 +3061,10 @@ void CGEvent::giveContents( const CGHeroInstance *h, bool afterBattle ) const
 		iw.text << message;
 		cb->showInfoDialog(&iw);
 	}
-
-	if(removeAfterVisit)
-		cb->removeObject(id);
+	cb->removeObject(id);
 }
 
-void CGEvent::getText( InfoWindow &iw, bool &afterBattle, int text, const CGHeroInstance * h ) const
+void CGPandoraBox::getText( InfoWindow &iw, bool &afterBattle, int text, const CGHeroInstance * h ) const
 {
 	if(afterBattle || !message.size())
 	{
@@ -3043,7 +3078,7 @@ void CGEvent::getText( InfoWindow &iw, bool &afterBattle, int text, const CGHero
 	}
 }
 
-void CGEvent::getText( InfoWindow &iw, bool &afterBattle, int val, int negative, int positive, const CGHeroInstance * h ) const
+void CGPandoraBox::getText( InfoWindow &iw, bool &afterBattle, int val, int negative, int positive, const CGHeroInstance * h ) const
 {
 	iw.components.clear();
 	iw.text.clear();
diff --git a/hch/CObjectHandler.h b/hch/CObjectHandler.h
index fecbce764..215d7ad9a 100644
--- a/hch/CObjectHandler.h
+++ b/hch/CObjectHandler.h
@@ -413,7 +413,7 @@ public:
 	void onHeroVisit(const CGHeroInstance * h) const;
 	void onNAHeroVisit(int heroID, bool alreadyVisited) const;
 	void initObj();
-	void treeSelected(int heroID, int resType, int resVal, int expVal, ui32 result) const; //handle player's anwer to the Tree of Knowledge dialog
+	void treeSelected(int heroID, int resType, int resVal, ui64 expVal, ui32 result) const; //handle player's anwer to the Tree of Knowledge dialog
 	void schoolSelected(int heroID, ui32 which) const;
 	void arenaSelected(int heroID, int primSkill) const;
 
@@ -424,10 +424,13 @@ public:
 	}
 };
 
-class DLL_EXPORT CGEvent : public CArmedInstance //event objects
+class DLL_EXPORT CGPandoraBox : public CArmedInstance
 {
 public:
 	std::string message;
+	ui8 removeAfterVisit; //true if event is removed after occurring
+
+	//gained things:
 	ui32 gainedExp;
 	si32 manaDiff; //amount of gained / lost mana
 	si32 moraleDiff; //morale modifier
@@ -439,26 +442,42 @@ public:
 	std::vector<si32> artifacts; //gained artifacts
 	std::vector<si32> spells; //gained spells
 	CCreatureSet creatures; //gained creatures
+
+	void CGPandoraBox::initObj();
+	void onHeroVisit(const CGHeroInstance * h) const;
+	void open (const CGHeroInstance * h, ui32 accept) const;
+	void endBattle(const CGHeroInstance *h, BattleResult *result) const;
+	void giveContents(const CGHeroInstance *h, bool afterBattle) const;
+	void getText( InfoWindow &iw, bool &afterBattle, int val, int negative, int positive, const CGHeroInstance * h ) const;
+	void getText( InfoWindow &iw, bool &afterBattle, int text, const CGHeroInstance * h ) const;
+
+	template <typename Handler> void serialize(Handler &h, const int version)
+	{
+		h & static_cast<CArmedInstance&>(*this);
+		h & message & gainedExp & manaDiff & moraleDiff & luckDiff & resources & primskills
+			& abilities & abilityLevels & artifacts & spells & creatures & army;
+	}
+};
+
+class DLL_EXPORT CGEvent : public CGPandoraBox  //event objects
+{
+public:
+
 	ui8 availableFor; //players whom this event is available for
 	ui8 computerActivate; //true if computre player can activate this event
 	ui8 humanActivate; //true if human player can activate this event
-	ui8 removeAfterVisit; //true if event is removed after occurring
 
 	template <typename Handler> void serialize(Handler &h, const int version)
 	{
 		h & static_cast<CArmedInstance&>(*this);
 		h & message & gainedExp & manaDiff & moraleDiff & luckDiff & resources & primskills
 			& abilities & abilityLevels & artifacts & spells & creatures & availableFor 
-			& computerActivate & humanActivate;
+			& computerActivate & humanActivate & army;
 	}
-
-	void activated(const CGHeroInstance * h) const;
+	
 	void onHeroVisit(const CGHeroInstance * h) const;
-	void endBattle(const CGHeroInstance *h, BattleResult *result) const;
-	void giveContents(const CGHeroInstance *h, bool afterBattle) const;
+	void activated(const CGHeroInstance * h) const;
 
-	void getText( InfoWindow &iw, bool &afterBattle, int val, int negative, int positive, const CGHeroInstance * h ) const;
-	void getText( InfoWindow &iw, bool &afterBattle, int text, const CGHeroInstance * h ) const;
 };
 
 class DLL_EXPORT CGCreature : public CArmedInstance //creatures on map
@@ -634,32 +653,6 @@ public:
 	}
 };
 
-class DLL_EXPORT CGPandoraBox : public CArmedInstance
-{
-public:
-	std::string message;
-
-	//gained things:
-	ui32 gainedExp;
-	si32 manaDiff; //amount of gained / lost mana
-	si32 moraleDiff; //morale modifier
-	si32 luckDiff; //luck modifier
-	std::vector<si32> resources;//gained / lost resources
-	std::vector<si32> primskills;//gained / lost resources
-	std::vector<si32> abilities; //gained abilities
-	std::vector<si32> abilityLevels; //levels of gained abilities
-	std::vector<si32> artifacts; //gained artifacts
-	std::vector<si32> spells; //gained spells
-	CCreatureSet creatures; //gained creatures
-
-	template <typename Handler> void serialize(Handler &h, const int version)
-	{
-		h & static_cast<CArmedInstance&>(*this);
-		h & message & gainedExp & manaDiff & moraleDiff & luckDiff & resources & primskills
-			& abilities & abilityLevels & artifacts & spells & creatures;
-	}
-};
-
 class DLL_EXPORT CGQuestGuard : public CGObjectInstance, public CQuest
 {
 public:
diff --git a/lib/IGameCallback.h b/lib/IGameCallback.h
index 933b2005d..f58b2861a 100644
--- a/lib/IGameCallback.h
+++ b/lib/IGameCallback.h
@@ -65,7 +65,7 @@ public:
 	virtual void setOwner(int objid, ui8 owner)=0;
 	virtual void setHoverName(int objid, MetaString * name)=0;
 	virtual void setObjProperty(int objid, int prop, int val)=0;
-	virtual void changePrimSkill(int ID, int which, int val, bool abs=false)=0;
+	virtual void changePrimSkill(int ID, int which, si64 val, bool abs=false)=0;
 	virtual void changeSecSkill(int ID, int which, int val, bool abs=false)=0; 
 	virtual void showInfoDialog(InfoWindow *iw)=0;
 	virtual void showBlockingDialog(BlockingDialog *iw, const CFunctionList<void(ui32)> &callback)=0;
diff --git a/lib/NetPacks.h b/lib/NetPacks.h
index d4f6d5e7b..7f997c34c 100644
--- a/lib/NetPacks.h
+++ b/lib/NetPacks.h
@@ -237,7 +237,8 @@ struct SetPrimSkill : public CPackForClient //105
 
 	ui8 abs; //0 - changes by value; 1 - sets to value
 	si32 id;
-	ui16 which, val;
+	ui16 which;
+	si64 val;
 
 	template <typename Handler> void serialize(Handler &h, const int version)
 	{
diff --git a/lib/RegisterTypes.cpp b/lib/RegisterTypes.cpp
index b112d4b6d..025d1769d 100644
--- a/lib/RegisterTypes.cpp
+++ b/lib/RegisterTypes.cpp
@@ -22,6 +22,7 @@ void registerTypes1(Serializer &s)
 {
 	s.template registerType<CGHeroInstance>();
 	s.template registerType<CGTownInstance>();
+	s.template registerType<CGPandoraBox>();
 	s.template registerType<CGEvent>();
 	s.template registerType<CGVisitableOPH>();
 	s.template registerType<CGVisitableOPW>();
@@ -37,7 +38,6 @@ void registerTypes1(Serializer &s)
 	s.template registerType<CGResource>();
 	s.template registerType<CGMine>();
 	s.template registerType<CGShrine>();
-	s.template registerType<CGPandoraBox>();
 	s.template registerType<CGQuestGuard>();
 	s.template registerType<CGBonusingObject>();
 	s.template registerType<CGMagicWell>();
diff --git a/server/CGameHandler.cpp b/server/CGameHandler.cpp
index f00caca4d..704e711e0 100644
--- a/server/CGameHandler.cpp
+++ b/server/CGameHandler.cpp
@@ -211,7 +211,7 @@ void CGameHandler::changeSecSkill( int ID, int which, int val, bool abs/*=false*
 	}
 }
 
-void CGameHandler::changePrimSkill(int ID, int which, int val, bool abs)
+void CGameHandler::changePrimSkill(int ID, int which, si64 val, bool abs)
 {
 	SetPrimSkill sps;
 	sps.id = ID;
diff --git a/server/CGameHandler.h b/server/CGameHandler.h
index b1f5f6910..79e1b3b2f 100644
--- a/server/CGameHandler.h
+++ b/server/CGameHandler.h
@@ -108,7 +108,7 @@ public:
 	void setOwner(int objid, ui8 owner);
 	void setHoverName(int objid, MetaString * name);
 	void setObjProperty(int objid, int prop, int val);
-	void changePrimSkill(int ID, int which, int val, bool abs=false);
+	void changePrimSkill(int ID, int which, si64 val, bool abs=false);
 	void changeSecSkill(int ID, int which, int val, bool abs=false); 
 	void showInfoDialog(InfoWindow *iw);
 	void showBlockingDialog(BlockingDialog *iw, const CFunctionList<void(ui32)> &callback);