Tome Expertise

Benefit: You gain a +1 feat bonus to implement attack rolls that you make with a tome. This bonus increases to +2 at 11th level and +3 at 21st level.
    In addition, enemies adjacent to your conjurations or summoned creatures grant combat advantage. An enemy that is immune to fear is immune to this effect.

Published in Heroes of the Elemental Chaos, page(s) 145.