Githyanki Battlecaster
(Monster Manual IV, page 202, DnD 3.5)
[General]
A creature with this feat ignores arcane spell failure chances when wearing light armor.
Prerequisite
Githyanki, Ability to cast 2nd-level Arcane spells, Base attack Bonus +3
Benefit
The creature ignores arcane spellfailiure from any kind of light armor it wears.If it wears medium or heavy armor, or caries a shield, it has the normal arcane spell failiure chance.
Special
A Fighter or Wizard may select this feat as a bonus feat for those classes