So I'm on the Bloodmoon island and during the advocate quest I killed all the Black ring dudes around the Ancestor tree. When the fight was over, the Advocate and his crew appeared and they were immediately hostile. It seemed weird so I decided to google it and according to some information I've found (http://divinityoriginalsin2.wiki.fextralife.com/The+Advocate here, for example) he was supposed to talk with me. I retried the fight with black ring but the result is the same. Is there anything I can do and if not, do I lose much by killing the Advocate at this point without talking to him?
