Quote Originally Posted by Khedrac View Post
A 137 dispute

Underdark is a 3.0 book and monsters from 3.0 "may need some updating by the DM for their conversion to 3.5"
As such this remains DM's call and, as the same ability seems to now be a Deflection bonus for other monsters that is what my call would be.
Correction: Underdark was released in October 2003, and is most definitely a 3.5 book.