Cannibal

Cannibals are (probably) Villagers that want to kill you at night and come out at 10:00 PM.

What do they do?
Well during Day 5-, they just try to kill you, but if you have a base/shelter, they just try to look for a enterance to come in and kill you. During Day 6+, Cannibals with pickaxes come and try to break down your base/shelter. If you have a flying base/shelter, you are covered as long as you have a food supply.

How much HP do they take?
Well, since they are in groups, they take like 1/2 of your health per second, and 3/4 of your health per second when Cannibals with pickaxes come.