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Krowley got into magick when he was just a pup and he turned out to be somewhat of a prodigy. Using his newfound skill, he learned how to enter one of the safest places in the universe: Aeterna. He thought he would be alone there after hearing that it was a isolated paradise, but young and foolish Krowley was soon caught by Aeterna's protector Yui. She almost killed him but, noticing his age and inexperience, she gave him a chance to live and prove himself.
Krowley met Yui when he was hardly more than a pup. He had found a way to enter Aeterna using magick and Yui was pissed. She almost killed him until he realized that he was so young. She gave him a second chance and found out that he was actually a pretty cool guy who enjoyed helping out around Aeterna.