 They were Adjuchas in their early lives when saved by Halibel, the three joining her cause to protect themselves from male hollows that prey on them.Some time after Halibel's audience with Baraggan, the Tres Bestias tried to help Halibel when her base was attacked by a hammerhead arrancar who wanted to kill their leader for her act against him when he was a hollow in Baraggan's court.Though the Tres Bestias were easily defeated, they were saved by Sōsuke Aizen.