User blog comment:Xilinoc/Ch. 597 - Winded by the Shadow/@comment-24572618-20140919020002/@comment-11051098-20140919223046

The soul piece each Sternritter received when they got their Schrift, returns to Yhwach. Whether their special ability goes to him with it, remains to see, but I can't see that happening.

If that should happen, imagine how powerful he would be with only "The Visionary", "The Wind" and "The Power". Super strong, untouchable and able to kill everyone by imagining it. He would be far too overpowered if that should happen.