Bowstring of Accuracy
This silver cord makes your bow strike true when you fight alongside allies of your sibling races.
Wondrous Item 3,400 gp
When you use your elven accuracy racial power while you have a drow or eladrin ally within 10 squares of you, you gain a +2 bonus to the reroll.
Power Encounter (Free Action)
Trigger: You miss with an attack using the bow this bowstring is fitted to while you have an elf ally within 10 squares of you.
Effect: You expend your fey step racial power or your use of the Lolthtouched racial trait and reroll the attack roll.
Published in Adventurer's Vault 2, page(s) 132.