For the boss, stay back ni stage 1. Dodge the lightning attacks, immediatly follow with 3 point magickal attack. Stage 2 he will make 3 zombies. As the 3rd is appearing, cast a 5 point magickal attack. And in stage 3, good luck
He will try to attack you with this green beams. Dodge it, and the nanosecond you notices he didn't attack, cast a 3 point magickal attack, because he's resting. And you don't have much time to pull it off.