+3 hp per rat kill? In sewers? (also with toxic damage surpassing protection and toxic resistance working properly it can turn an extreamly dangerous branch for an armour reliant class into a relatively easy trip to a hopefull harpoon.
There us so much healing from shrooms that extra hp from lifetap does very little. I don't see any class as being armor reliant, armor is trash, better to not get hit. Would much rather spend the talent points on things that will help me kill all the yendors.