Board Thread:Improvements and Issues/@comment-37675682-20200224131442/@comment-5398287-20200224165427

"Bleach: Can't Fear Your Own World establishes that the energy permeating the three worlds is known as Reimyaku; this is what certain Kidō spells like Hadō #99. Goryūtenmetsu tap into when forming their energy constructs, and each world's Reimyaku is different, with Hueco Mundo's having affected Yasutora Sado to the point of drawing out his Fullbring's true form unlike that of the Human World and Soul Society."

Something like that. Make sure to reference the chapter it's mentioned in too.