Solution Found
Ferret said:
Could I have some help recreating a Dagger from the 1995 movie The Shadow? It was an intelligent(Barely sentient, by my recollection) dagger that could burrow into the victim. Plus it was evil.
I believe in handling this a little more simply than some people, apparently.
First of all, the style of dagger from the '95 Shadow movie is called a phurba. It's a Tibetan dagger more often used as a holy symbol than an actual stabbing people weapon.
You might be able to find special stats for it, but I'd just treat it as an SRD-issue punch dagger.
The flying around is best simulated by giving it the dancing ability (again, out of the SRD). The burrowing into the victim business could be simulated with the wounding power from the SRD, but it sticks in my mind that there's a weapon ability from The Book of Vile Darkness called biting or grinding...maybe gnawing. Anyway, this ability is activated by a command word whenever a hit is scored: the weapon hangs onto the victim and starts chewing through their flesh for 1d6 or 2d6 points of damage a round. That's a better match cinematically, but you may not have the BoVD.
Adding intelligence to the weapon, of course, is trivial with the SRD. Throw in any other properties you like and give it whatever bonus you want.
Just bear in mind this thing's pretty powerful: by the rules Wounding is a +2 bonus and dancing is a +4 bonus, so you're moving into epic territory even without intelligence. Add intelligence at your own risk, or the phurba may be wielding its user, not the other way round.