[D&D Adaptation Question] Swallow Whole rules and mechanics?

[Anthony]

Originally Posted by gilbertocarlos

Wait, so there's a feat who makes you able to do that, it's not automatic? You should've said that on your first post.

It's a special attack, not a feat. In any case, I believe it's a special case of Binding in GURPS; I don't have Powers at hand, but IIRC it's mentioned in there.