Focused Antimagic
(Lords of Madness, page 45, DnD 3.5)
[Monster]
A beholder with this feat can focus the antimagic of its central eye to target a single person or object.
Prerequisite
Beholder with functional antimagic ability
Benefit
The creature can reduce the cone-shaped area of effect of its central eye to target a single creature or object. The target must be within range of its normal cone-shaped effect (150 feet).