How does NPC Damage work? When will the portraits change?
There are four levels to the changes. If the NPC has more than 75% of his hitpoints, the normal (unaltered) portrait will show. Once below 75%, the portrait will change, and then further increase in severity (and gore!) when the NPC’s hitpoints decrease to below 50%, and finally 25%. Healing will restore previous portraits, relative to how many hitpoints the NPC has.