[the REAL Minos Prime]

If this was a real life scenario and I was fighting for my life and I don't have the energy to cast ballcrusher I'll definitely drink a potion and not destroy my lifeforce to finish him off, especially if it does a whopping 4x the cost in hp.

This idea would be better as a specific skill instead of a global mechanic imo

I think it could work as a trait, which gives you a toggleable passive, so you dont have to waste skill slots or lock it to a specific class.