Ohh, I actually noticed that Librum Equitis was on sale for five bucks as well. PrC's for every purpose
I will soon be posting some additional stuff on the Steam Grafts, making updates according to the good feedback I got so far. Yet, the Lightning Grafts will probably have to be retained for the book (need something not seen before in it after all).
Kit: I really love the Void Template, havent found much wrong about it
Just one thing I was wondering, when the Void Claimed animates the dead around it, are they under the control of the creature or free willed? And it simply says they animate as per the Animate Dead spell, but it doesn't mention as what kind of undead (skeleton or zombie). Since flesh-covered corpses can be animated as skeletons too, you might want to mention it quickly. Since it sounds as an automatic ability, it might not be possible for the Void Claimed to change its properties.
A good idea might allow the amount drained with Energy Drain to vary if the creature increases in size or HD. Could be, for example:
1 level if the creature has 1-10 HD, 2 levels if it has 11-20 HD etc.
As it decreases in movement, it might be suitable to rule that it looses some dexterity instead of gaining some. Could always increase strength.
The Void Claimed Gyrosphinx is kewl, really good example of a creature that would rock with the Template on.