William certainly had an old and close relationship with the sea god Poseidon.
Besides being Artemis's uncle, Poseidon also served as her mentor. With Artemis married to William, their relationship became even closer.
After the cataclysm, Poseidon, cautious, used a secret technique to leave a fragment of his soul in the Prime World, reincarnating every hundred years. William had sought him out many times.
Most of the time, however, he didn't retain Poseidon's memories and lived aimlessly for tens of thousands of years. Now, this fragment of his soul was as weak as it could be.
Seeing Poseidon joining the witchcraft cult under the guise of Delmar, William didn't know what to say.
Sure enough, once memories were restored, he was as shameless as ever!
Delmar, dressed in ancient-style white underwear, casually threw his sea-blue robe into a nearby trash bin and then turned to Moros, asking, "Sir, how may I address you?"