I can get on board with Supernatural and random, but it should stick to Strength-based. Sure, the save DC is high, but critical hits aren't too difficult to divert at mid-levels (fortification armor immediately leaps to mind).
18-20/x3 is standard for augmented critical.![]()
Maybe 10?
SA bite acts as a sword of sharpness, +2 to initiative
Training a Quickbiter...It'll cost you an arm and a leg.
10 improving to 15 sounds good.
Make Ethereal Plane its home plane (since we've linked them to ethereal marauders)?