Ability Focus
(Monster Manual V, page 204, DnD 3.5)
[General]
The special attack of a creature with this feat is more potent than normal.
Prerequisite
Special attack
Benefit
Add +2 to the DC for all saving throws against the special attack on which the creature focuses.
Special
A creature can gain this feat multiple times. Its effects do not stack. Each time the creature takes the feat, it applies to a different special attack.