Warning: This is 3.0 Edition material. It is possible that there is more recent 3.5 Edition version.
Inaccurate?

Spell Girding

( Magic of Faerun, p. 22)

[General]

Your spells are particularly hardy, resisting dispel checks more readily than normal.

Prerequisite

Benefit

Any dispel checks against your spells are made with a -2 penalty.