nudnic wrote:I was hoping to use material from some D20 books I already own. Not to mention I'm a fan of the classis D&D stuff, like Mind Flayers and Beholders and what not.
If it's not in the SRD (as is the case with your two examples), then it won't be in the True20 Bestiary
. This page
on my "Errata & Notes" site lists which MM
creatures do not appear in the True20 Bestiary
(and which of those are non-OGL).