Your rune-scribed projectile calcifies flesh and causes your foe to falter.

Daily   ✦     Arcane, Weapon
Standard Action      Ranged weapon

Target: One creature

Attack: Intelligence vs. AC

Hit: 2[W] + Intelligence modifier damage, and the target is slowed and gains vulnerable 5 to melee attacks (save ends both).

Miss: Half damage, and the target is slowed (save ends).

Update (11/23/2009)
Beneath the Hit line, add “Miss: Half damage, and the target is slowed (save ends).”

Published in Eberron Player's Guide, page(s) 51.