When a Ninja (hero) attacks while in his invisible state, the first attack should be double damage, maybe a gold sword.
Heros should have some sort of weapon that does extra damage to bosses.
Spider silk should have its potency lowered to 0 so that they don't damage on contact, but should be fixed so that they do freeze players they hit.
Significantly raise the health of Golems.
Lower cast time on dervish dance skills. Right now he is too vulnerable.