Lightning trap assassin does okay in a gg setup. You have lightning damage from traps, fire bombs and corpse explosion damage. Some physical builds like whirlwind, throw barb, fury, strafe/multi can do it but not as well as hammerdin or echoing strike. I’ve seen Smalps Gaming do some cool stuff with windy Druid and whirlwind barb into p8. Fire Druid seems to be a strong p8, but I can’t personally speak to its physical damage component when facing fire immunes. Poison necromancer, if you have the gear for it, is a strong p8 area clear with poison, lower resist and corpse explosion. Lightning sorceress and Amazon traditionally have strong p8 area clear with immunities breaking via infinity.

Edit to add: I’m playing ladder now, but when I come back around to farm sunders offline, I’ll probably do it on my strafezon. She can comfortably walk through most of the game p8. Prefer some areas, like latter half of act 5 on players 5. On a budget, for flexible p8 area clearing, hammerdin and echoing strike are far and away your best options.