“ I see you're shocked. Well, so was I when the pirates dragged me in here. I thought they were going to kill me. But Maerhen is a very religious man, so he treated me well. He did keep me trapped down here, but never once did he try to hurt me. Even after the pirates all fled from the hideout, the guard made sure to bring me plenty to eat and drink every day.”
—Law, in a conversation with Katri
Fifteen years later, Law and Katri decide to travel to the Temple of Mars in order to leave her in the care of Eisenbaha. However, their ship is attacked by the Isla Pirates led by Maerhen, which results in their separation. After he is slain by one of Maerhen's pirates, his body is possessed by the White Master Morse. At the end of Map 13, Law meets Katri with the help of Maerhen, who treated him well due to his status as a priest. Over the course of the story, he reveals the history of Lieberia and the deities to Holmes.
In the ending, Holmes reveals Law's true identity as Morse and asks him when he intends to tell the truth to Katri.