It would be a Physical-based melee attack with a skill check mechanic where there would be some sort of meter with a timing for when to press again for maximum power. It would require the "Arms!" evolution, or if i can think of something else for this mechanic then that would change. It would give carsinization and predator and imposing affinity.
#Mantis shrimp punch
orchid imp
raven valley
This is already in the game. It's a relatively quick-fire ult that deals massive damage. actually I guess that's technically a pistol shrimp.