Board Thread:Questions and Answers/@comment-10797017-20130624101208/@comment-11051098-20130713132510

It would appear to be a multi-caster creation, but I dunno about spell. But I think that works differently, cos they apparently get their left arms back when the "show is over".

They were "lightly burned" by Yamajii's flames when they attacked him after he vertically bisected Ayon in FKT. But now that we see them again in the final arc, they have their left arms, before tearing them off to again create Ayon.