2 new interesting looking souls have just opened up and they finally use bows (still nothing on arcane side). They seem fun though no epic version yet (not that I have the sp to get that one with all the others but Mordred still to unlock). Bit of a cross breed between having hp and all out attack but at the cost of removing all the buffs on your character using their unique skill.

As for Medusa well lets put it like this. You either have the right party and a lot of luck to be able to do it or its a complete waste of time, ap and an unnecessary amount of stress.
Amon's ability is a perfect counter to Medusa but as its heavily likely you get only one use out of it before either she, your team or Amon are dead all it comes down to is luck. Luck that Medusa doesn't just immediately follow up with it again or luck that if she does its doesn't effect 3 or 4 of your 5 man group before bursting / getting her to stun status and guaranteeing you wipe as she AoE poisons or ultimate skill's you.

Having to win due luck should not be a part of a boss battle, it should never be a part of boss battle.