Lots of small adds = teleport in (which causes nova) and nova again if some survived.
Single big mob: lightning blast spam from a safe distance.
i do wish i had your idols >_> been farming for a while now, but 0 decent idol drops.
You can look into using 1 unique (helmet) to cast nova from range.
But that would cause some issues for glancing blow cap.
My helm give me 176% Increased Crit Chance
And I use LB for distance and huge foes
EL is only for trash mobs