btw, a good choice for high dmg + mf, and having the "cannot be frozen" suffix is an eth runemaster 'ZodIstIstIstIst'
good mf, good dmg, don't need a cham for your steel skull.
and if you are having AR problems, a ptopzed arreats is a good choice. dmg, fhr, LOTS OF AR, and resist. it's sexier than steel skull i think