I would be okay with the swap for anti-paladin | oracle or kineticist | oracle. Kineticist would be interesting choice as it's ranged option (so thus we got two melee and two ranged) but kineticist would have many potent battlefield control effects with certain elements picked up. Also okay if we hold and do bit light RP before we bring down the lich (sort cinematic battle scenes and discussion with each other or overall RP before battle is initiated to lich's capital).