its not , u should have less in strength and more in spirit, 5 is just not enough for ownage spells
i use a creature (with crystal skull) and the healing demon,
then i just let the creature take all the damage and aoe then with firewall, aoe rocks! then u can whirlwind them.
also try to avoid the ranged magic, attacks by jumping, it helps alot
also make sure u have enough potions at hand when u are melee, helps alot too