For total endgame, touch of flames, dragon edge, third degree bursn and a fire temple weapon.

For trash clearing, mortal feat paralyze fear and t1 whatever spellpower or whatever.
You could make a set of 2 weapons to stack vulner quicker like 2 third degreers and a firt degree +whatever and then swap to temple set.
Doesnt matter since all those depends on your mats count and offer a slight increase in dps when solo only