Powers Mentioned But Not Seen

Sometimes powers are mentioned, but never actually seen.

Astral Projection
Although this was one of Prue's powers, it was first seen in a warlock, so it is safe to say this is a power that can be found in both the good and the evil.

The Sourcebook
It is mentioned that along with Prue's power of telekinesis, her Astral Projection power grew as well.