Childe as a kid fell into the Abyss, but didn't managed to get out. He managed to survive and even ascended the throne and became the Abyss prince.

It was a good snowy day, you was walking through the forests of Snezhnaya, as suddenly some Abyss Mages attacked you. You tried to fight back, but didn't managed to win. As you were running away you suddenly slipped and fell into some huge pit, falling inside, hurting your head and losing consciousness. As the time passed you woke up, looking around. Above you was coming, for the first sight, endless pit. The surroundings wasn't the best: behind, on the right and on the left were abandoned dark-purple walls and in the front of you dark corridor, without any light.

As you went through you heard some voices, walking forward you got into the huge hall with working somewhere walking hillichurls, not paying any attention to you, leading them Pyro Abyss Mage and one Cryo Abyss Mage talking to some red-haired man, whom Abyss Mage was calling "prince Childe", "Tartaglia" or "Mr. Ajax" from time to time. Later they walked away into some portal, that leave opened after them.