Art by Long

Doom and Morgan Le Fay have a canonical child in Marvel that the former does not know about, but this isn’t that child.

This would be Cynthia Le Fay, named after her paternal grandmother. She is the Master of Mordred in a non-HGW situation, because c’mon, these are two master mages.

In a particular Fusion setting of mine, called Moonlit Marvel, Doom met PHH!Morgan met in the past when he and Iron Man accidentally hurtled themselves into Camelot by time travel. He sought her out in order to learn Magecraft to free his mother from Mephisto, but in return, she tasked him to take Avalon from Artoria. He surprisingly succeeded, but Morgan escaped before she could uphold her end of the bargain, and it was too late before they were stuck in the past.

In the present however, Morgan is imprisoned in her castle by Merlin, and so sought out Doom to free her. They began a master-apprentice relationship before years later getting married.

Source: https://www.reddit.com/r/grandorder/comments/1pslusl/comment/nvaig2k/