diff --git a/Source/missiles.cpp b/Source/missiles.cpp
index 7ad185168da..95ee4790e5a 100644
--- a/Source/missiles.cpp
+++ b/Source/missiles.cpp
@@ -368,7 +368,7 @@ bool Plr2PlrMHit(const Player &player, Player &target, int mindam, int maxdam, i
 
 	int dam;
 	if (mtype == MissileID::BoneSpirit) {
-		dam = target._pMaxHP / 3;
+		dam = player.isOnArenaLevel() ? target._pMaxHP / 3 : target._pHitPoints / 3;
 	} else {
 		dam = mindam + GenerateRnd(maxdam - mindam + 1);
 		if (missileData.isArrow() && damageType == DamageType::Physical)
@@ -393,8 +393,8 @@ bool Plr2PlrMHit(const Player &player, Player &target, int mindam, int maxdam, i
 				break;
 			case MissileID::Firebolt: // 100% (200% of default)
 				break;
-			case MissileID::FireWall:  // 100% (200% of default)
-				dam = dam * 3 / 2;     // 150% (300% of default)
+			case MissileID::FireWall: // 150% (300% of default)
+				dam = dam * 3 / 2;
 			case MissileID::FlameWave: // 200% (400% of default)
 				dam *= 2;
 				break;
@@ -418,17 +418,24 @@ bool Plr2PlrMHit(const Player &player, Player &target, int mindam, int maxdam, i
 
 	bool isOnArena = player.isOnArenaLevel();
 	int charLevel = player.getCharacterLevel();
+
+	// Error handling for critical hit calculation to avoid dividing by 0 in case of bad actor.
+	charLevel = std::clamp(charLevel, 1, static_cast<int>(GetMaximumCharacterLevel()));
+
 	bool isSpell = !missileData.isArrow();
-	int critChance = (charLevel * 2 + (isSpell ? player._pMagic : player._pDexterity)) / 10;
-	bool forcehit = false;
+	int crit = (isSpell ? player._pMagic : player._pDexterity) / (charLevel / 4);
+
+	crit = std::clamp(crit, 0, 50);
+
+	int critper = GenerateRnd(100);
 
 	// PVP REBALANCE: Crit chance for arrows and spells in arenas. Crits force hit recovery.
-	if (isOnArena && GenerateRnd(100) < critChance) {
+	if (isOnArena && critper < crit && mtype != MissileID::BoneSpirit) {
 		dam = isSpell ? dam * 5 / 4 : dam * 3 / 2; // Arrow: +50% damage, Spell: +25% damage
-		forcehit = true;
 	}
 
-	if (resper > 0 && mtype != MissileID::BoneSpirit) {
+	// PVP REBALANCE: Bone Spirit is unaffected by resistances on arena levels.
+	if (resper > 0 && (mtype != MissileID::BoneSpirit || !player.isOnArenaLevel())) {
 		dam -= (dam * resper) / 100;
 		if (&player == MyPlayer)
 			NetSendCmdDamage(true, target, dam, damageType);
@@ -442,7 +449,7 @@ bool Plr2PlrMHit(const Player &player, Player &target, int mindam, int maxdam, i
 	} else {
 		if (&player == MyPlayer)
 			NetSendCmdDamage(true, target, dam, damageType);
-		StartPlrHit(target, dam, forcehit);
+		StartPlrHit(target, dam, false);
 	}
 
 	return true;
diff --git a/Source/player.cpp b/Source/player.cpp
index f1ca3c908c6..e1283d49c49 100644
--- a/Source/player.cpp
+++ b/Source/player.cpp
@@ -316,7 +316,6 @@ int GetSpellSkippedFrames(SpellID spl)
 	case SpellID::TownPortal:
 		return 4;
 	case SpellID::Flash:
-		return 1;
 	//case SpellID::StoneCurse:
 	// Page 3
 	case SpellID::Phasing:
@@ -336,6 +335,7 @@ int GetSpellSkippedFrames(SpellID spl)
 	case SpellID::Teleport:
 		return 1;
 	case SpellID::Apocalypse:
+		return 0;
 	case SpellID::BoneSpirit:
 		return 1;
 	case SpellID::BloodStar:
@@ -899,15 +899,20 @@ bool PlrHitPlr(Player &attacker, Player &target)
 
 	bool isOnArena = attacker.isOnArenaLevel();
 	int charLevel = attacker.getCharacterLevel();
+
+	// Error handling for critical hit calculation to avoid dividing by 0 in case of bad actor.
+	charLevel = std::clamp(charLevel, 1, static_cast<int>(GetMaximumCharacterLevel()));
+
+	int crit = isOnArena ? attacker._pStrength / (charLevel / 4) : charLevel;
+
+	crit = std::clamp(crit, 0, 50);
+
+	int critper = GenerateRnd(100);
 	HeroClass charClass = attacker._pClass;
-	int critChance = isOnArena ? (charLevel * 2 + attacker._pStrength) / 10 : charLevel;
-	bool forcehit = false;
 
 	// PVP REBALANCE: New crit chance formula for arenas. Crits always cause hit recovery.
-	if ((isOnArena || charClass == HeroClass::Warrior || charClass == HeroClass::Barbarian) && GenerateRnd(100) < critChance) {
+	if ((isOnArena || charClass == HeroClass::Warrior || charClass == HeroClass::Barbarian) && critper < crit) {
 		dam *= 2;
-		if (isOnArena)
-			forcehit = true;
 	}
 
 	int skdam = dam << 6;
@@ -926,7 +931,7 @@ bool PlrHitPlr(Player &attacker, Player &target)
 	if (&attacker == MyPlayer) {
 		NetSendCmdDamage(true, target, skdam, DamageType::Physical);
 	}
-	StartPlrHit(target, skdam, forcehit);
+	StartPlrHit(target, skdam, false);
 
 	return true;
 }