When fighting Gildal and using the gourd as requested by the quest, he goes invisible a short time after. He still has hit boxes but nothing to identify where he is at. On top of that he pulls you in to his attack and you get stuck there for a few seconds without being able to dash/roll out unless you spam the ability. i didnt record since it happened out of nowhere (still won though aha haa) but there is a Youtube video of someone else having the same issue that i will attach.
Youtube video credit goes to INVISIBLE??? 3rd SWORD GILDAL | LOST ARK CHANGHUN TOURNAMENT | SHADOWHUNTER