as a level 40 vamp i got a mini quest from a Hib. commander (sgt lieut whatever....) anyhow, they self heal and were yello to me, and kept killing me but the quest is kill 3
they are hostile, so no matter how many of them youll kill, theyll stay hostile and wont aggro. they are quite good mobs for light-nukers, since they are very vulnerable to heat. but be prepared when they call for help. suddenly the whole forest gets in motion and starts to dot and root you and heal themselves. better run then ;)
They are hostile to me. Good thing too because the first time I ran through toward Koalinth I almost had a heart attack when hit f8 and targetted a purple.