Physical immunes are a nightmare oh man

yes, and my ideal settup uses an infinity merc so cant even have decrepify. and my fire dmg is so random! large phys immune swarms like the locusts in act 2 it kills fine, but one single guy, not really. thats when i get out of shapeshift and use my other spells. however my best fire dmg spell, fissure is low level because its not a dmg increasing synergy for geddon. lol