User blog comment:Xilinoc/Ch. 554 - Desperate Lights/@comment-5695542-20131025144020/@comment-16214733-20131025184026

The Letzt Stil is basically the original form. The Vollstandig is the upgraded version of the original because they won't lose their powers unlike the other one. I also think it ain't the one-shot-and-done type since they can turn it on and off.