How do you beat Super Boss fights with no losses?

[DGDobrev]

You need something with both physical and poison or fire damage. Trolls should do it, but the chance of spawning poison spiders is bigger than flame spiders. Maybe a decent stack of Black Knights with splinter and some fire protection gear on them will rule, because if everything's ok, you'll need evlin every 10 turns or so, which is bearable, because you'll be gaining mana through lvl 3 transmute constantly.