Hmm with no real threat from interrupts might i suggest a E/Me farmer using earth magic damage reduction and Silver armor along with Mantra of Flame. Or if the degen is a problem maybe an E/D using Mystic Regeneration. You could either use Ob Flesh or Glyph of renewal as the elite.
go 600hp bring smite hero just watch out that the smiter hero isnt staning in a burning area, you can do HM and get cool drops like darkwing def and thngs like that. also theres a ele boss called blisterbarks you can kill it too for elite tome / green staff