Yn was the first pawn before issie after was known as a devil by rias they paid attention to issie because he's the red dragon emperor Yn had power he just needed a boost after being let go by rias Yn told them that he'll hunt them one by one and have there heads on there wall after arriving to hell he told sirzechs what happened so sirzechs told him a way to get stronger but the procedure will be painful or possibly kill Yn then Yn agrees to the procedure Yn became more then human or devil he became the beast that was him all along
Yn Procedure
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