I had an idea that fire damage based weapons ( fire proc ) would do more dmg to him also armor with descriptions like "armor is made to keep the cold out" "its like living in a fridge" " mmm frosty " or flame armor ect... might null dmg. Not to sure cause I don't want to spend cash and it fails also 3-4 hits I'm dropped. A group or mid 30s - low 40s died trying