User blog comment:Xilinoc/Ch. 637 - BABY, HOLD YOUR HAND/@comment-7805464-20150730101848

So, Yhwack man somehow brainwashed the left arm of Soul King? Making it think it's a quincy called "Pernida" and was tasked to be a Sternritter? I can totally feel how excited Mayuri feel, being the mad scientist with crazy desire for these experiments, he must be so real madly joyful if he can take a part of the Soul King.