Corrupt Spell Focus
(Heroes of Horror, page 120, DnD 3.5)
[General]
All spells you cast that have a corrupt component (such as call forth the beast*, master's lament*, or chain of sorrow*) are more potent than normal. *New spells described later in this chapter.
Prerequisite
Any nongood alignment
Benefit
You add +1 to the DC for all saving throws against any spells you cast that have a corrupt component.