Petra

Petra is an NPC in Moonhaven. She plays a part in the Storyline, particularly in Chapter 5: Cursed Lands.

She allows access to the Forgotten Temple.

During Black Moon, talk to her to join the event. Then, submit 3 or 7 Seal of Excavation in order to receive rewards from her.

Chapter 5 requires three Seal of Excavation to be submitted to Petra before choosing a Sign from General Van Handel and receiving a Path Coin.