yup, thats one of the 3
I do remember for sure that the build used the
Body Leech PrC from the Mind's Eye archive (and maybe Thrallherd), but I haven't been able to find the original. I think it was from Caelic, but I could be mistaken, as I seem to have convoluted his Boogeyman build and this one...
Evidently it was a very popular/well-remembered build, as I find several people referencing it across multiple forums as one of the most evil/memorable builds they'd seen.
Edit: Redoing the build would probably be a good idea, anyway, as I'm pretty sure it used psion as the base, and ardent would probably be better as 1) you can "make up" for the lost manifester levels with Practiced Manifester and 2) the number of rounds you have to use your leeched power points is based on Wisdom (and Ardent is a wis-based manifester).
Whatever you do, it will be a high-level build as the Body Leech requires you to be able to manifest Mind Switch, which is 6th level. So you'd have to be 16th level to get the Body Leech capstone. If you're using homebrew or PF, there are ways to get nearly identical abilities much earlier.