Bugs
-battle arena magical resistances seem to be at -100 or extremely low. Paralyze and fear deals full or double damage. Outside of arena these damage appropriately to adjusted resistances.
-melee combat seems fair and well rounded (well done there)
-crossbow inside of battle ground has not been slowed down with speed.
-missile swarm does no damage and causes no effect, seems as if the script is possibly missing. Works visibly, but no scripted effect happens.
-monsters do not receive knock back effect
Suggestions
-add a knock back effect for special spells and weapons
-remove knock back as a standard effect when taking damage