Hmm, some of my players will be using this (as I may for a monster or two ), so I hope you don't mind if I poke it a bit with a few quetions/observations
Out of curiosity there are feats granting access to mutations, should it be assumed that these bar them from the others, or are the others still free game?
When one takes for instance plant Teratomorphisms, then are they locked into those, or can they still use the generic ones at any level?
Same question for Ascendancy/perfection.
"Undeadist", Perhaps a Thanatologist?
Anywho afraid I mostly skimmed, so I can't give an all out critique on every ability, but looks cool sorry if any of these were asked before.