The Forge of Creation is a home world for Celestialsapien (Alien X's species).
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The Forge of Creation is a place hidden to everyone except its inhabitants, Paradox and whoever has the Map of Infinity. Aggregor plans to head to the Forge of Creation to absorb powers within and become unstoppable. It is the home of Celestialsapiens, Alien X's species. It appeared in the episode The Forge of Creation.
Because Paradox is not allowed to be within 500 light years of a Celestialsapien, he is not allowed to enter it even though he can but not without the locals taking notice of his presence.
Celestialsapien in The Forge.