
get yourself a +earth helm, and a +3 earth rune (only like 300 gold, lol) then take the following spells.
iron mist
earth attunement
kinetic armor
magnetic aura
ward against foes
ward against melee
stone daggers
obsidian flame
double starts casting a bunch of wards and spells that are extremely useful.... but happen to be utterly useless against your attack spells. while its busy casting its sweet protection spells. you kill it in about 4 casts of obsidian flame, while spamming stone daggers.
quick, easy, no reason you shouldnt get the bonus.