Let me tell you, my friend, about the Conqueror Ooze.

A Cave Druid who wildshapes into a Carnivorous Crystal Ooze with a 7d8 Slam attack, which he Strong Jaws for a 14d8 Slam attack.

He then goes into Martial Artist Monk to be able to full attack with that 14d8 slam and also becomes immune to fatigue.

Then he Multis into Barbarian for Furious Finish so that that 14d8 is maximised with improved and greater vital strike for a total of 56d8 maximised dice (448 damage just from weapon dice alone) which is enough to One Punch Man most enemies. Because you are immune to fatigue, you can rage cycle and do this every round.

Ta dah?