Called after a living entity took damage, unless they were killed. The base damage taken is given as damage
taken before armor or enchantments are applied, but after other effects like shields are applied.
Parameters:
entity - the entity that was damaged
source - the source of the damage
baseDamageTaken - the amount of damage initially dealt
damageTaken - the amount of damage actually taken by the entity, before armor and enchantment effects
blocked - whether the damage was blocked by a shield