Beholder Bloodline (3.5e Feat)
From D&D Wiki
Beholder Bloodline [Racial]
You have tapped more deeply into your inherited bloodline than most others, and as a result a fully functional stalked eye has sprouted from your back.
Benefit: Your extra eye grants an additional +2 to all Search and Spot checks, but because of its abnormality you take a -2 on all Diplomacy checks. Additionally, this stalk can hold an additional spell for the purposes of Spell Mimicry, but it still takes a standard action to fire. Spells held in these eyes may be fired whilst uncurled.
Special: This feat can be taken up to ten times. Its effects stack.