I have a small proposal: let's first write the Hierarchical Mind and Partial Imprint as abilities of the false Keraptis template, since those are things they do. Then let's do a Subsumed Mind template. Mossmutter and skinpuppets can be slightly(?) exceptional examples of those templates. Also, I'm in favor of allowing some kind of actions for general subsumed minds and/or a little less freedom for skinpuppets, just to keep things a little simpler.