hey im making a bliz sorc for mf and am wondering, can bosses go into negative resistances, the reason i ask this is b/c im doing this for a mephisto mf sorc and am wondering if i should max cold mastery. My blizzard would do alot more dmg if i maxed cuz it could put mephisto into negative resistances, BUT i dont know if he can go into negative resists, to re-itarate he has 75 resistances im wondering if he could go down to -5 if i have -80 resistances for cold mastery.