Oliver Quarlic along with other Gur can be encountered in the Gur Camp attending a funeral for the fallen from a recent offence on Cazador's palace. Oliver with his fellow Gur, all members of a group of monster hunters lead by Ulma, are looking for their children, who have been kidnapped by Cazador's spawns. The nomads have camped in Rivington, trying to mount a rescue or seek revenge.
Ulma asks the party to help in defeating Cazador and discovering the fate of their abducted children.
Once Cazador is defeated, Oliver along with Ulma and the other Gur can be found near the waypoint in Cazador's Dungeon. He attacks the party if the ritual held in the dungeons is completed.
If Astarion was turned in to Gandrel in Act One and kidnapped, then in Act Three Oliver and all of his fellow Gur (except Gandrel) are dead.
Your attack summons thorny vines that possibly Ensnare your target.
Ensnared creatures cannot move and take 1d6Piercing damage at the start of each turn. An ally can use their Help action to try and tear away the vines.