Originally Posted by Lord_Gareth
I didn't list the book because it's in the SRD.
If it's in the SRD, I'd recommend making the Prereq also a link to the appropriate page for ease-of-reference.
Whirling Dervish+Greater Life Leach+Army of low-level characters=Kill ALL
Edit: Mostly balanced by how Temporary HP doesn't stack. Seems alright to me.