I've revised Assimilate to fall more in line with Digestio. It's more useful now and allows you to absorb any single aspect of your opponent, rather than just an ability score. I have a feeling that may have been Krusty's original intention anyway.
Assimilate (Su)
Absorb aspects of opponents you consume.
Prerequisites: Con 70 (or Cha 70 if Con - ).
Benefit: You gain one aspect of each opponent you defeat and consume.
This can include HD, an ability (no greater than esoteric), or an ability score.
e.g. If you defeat an opponent...
...with more HD, your HD increase to equal it's HD.
...with more Str, your Str increases to equal it's Str.
You can choose any aspect you are aware of, randomly, or no aspect.