From the Wandenreich's escape to One Piece

He transmigrated into the world of Bleach as an ordinary Quincy in the Wandenreich. He was a contemporary of G. Littor Lampard of the Sternritter. Beltz, who initially thought he'd only ever be a lowly soldier, unexpectedly gained the ability to travel to the world of One Piece. Knowing that the Quincy's so-called holy war and revenge were merely Yhwach's means to ensure his survival, and that Yhwach would eventually absorb all the Quincy he used as batteries, Beltz's goal was to take those he cherished to the world of One Piece to survive. After all, no matter how powerful Yhwach's Saint Seiya was, it couldn't possibly devour him in the One Piece world. However, his own strength was too weak, so he needed the help of the Wandenreich. He used the resources of both the Bleach and One Piece worlds to establish himself in the One Piece world, eventually severing all ties with Yhwach and settling down there. His first step was to eat the Blue Dragon Fruit in God Valley.