Abelas is an ancient elven sentinel who guards the Well of Sorrows at the Temple of Mythal. He was born in the last years of the original elven empire, and has been in a form of stasis on and off for years.
If the Inquisitor completes the temple rituals, Abelas confronts the Inquisitor and their party. He assumes they are after the Vir'abelasan, the Well of Sorrows and refuses to grant access to it. When the Inquisitor explains that Corypheus is of the Tevinter Imperium, the nation that destroyed Arlathan, Abelas corrects that before the temple doors were closed, the Elvhenan fell due to internal strife, not the Imperium, who merely took what remained.
If the Inquisitor completed the ritual, Abelas is opened to an alliance, otherwise the sentinels will attack. Either way, Abelas runs off to destroy the Well before it can be desecrated. Morrigan transforms into a bird and follows him.
Just after the Inquisitor had dealt with Samson/Calpernia, Abelas is about to reach the Well, only for Morrigan to get there first and blocks his path. Abelas reveals that the Well contains the knowledge of all previous servants of Mythal and he fears it will be lost if an outsider touches the Well. If an alliance was established earlier, Abelas can be convinced to relent and allow the party access to the Well. However, he warns that partaking from the Well will bind the drinker to the will of Mythal forever. He contradicts Morrigan's claim of Mythal being banished to the Beyond by Fen'Harel, stating that she was murdered by those who destroyed her temple, but the Dread Wolf was not responsible. Afterwards, he departs.If the Inquisitor didn't ally with Abelas, he will attempt to destroy the Well, forcing Morrigan to kill him.