Modron's most substantial appearance in Welsh literature is in the prose tale "Culhwch and Olwen". The text states that Mabon was stolen from between her and the wall by unknown forces when he was only three days old, and no one had seen him since. Recovering Mabon from his mysterious captors is one of the various challenges faced by King Arthur and his men in the story, and the adventure comprises a significant portion of the text. Arthur's men locate Mabon with the assistance of a series of wise and ancient animals, and liberate him in battle. Subsequently, he joins Arthur and assists in the hunt for the great boar Twrch Trwyth.