Swordmage Attack 1Booming Blade
A field of sound punishes your enemy if he tries to escape.
At-Will Arcane, Thunder, Weapon
Standard Action Melee 1
Target: One creature
Attack: Intelligence vs. AC
Hit: 1[W] + Intelligence modifier damage, and if the target is adjacent to you at the start of its next turn and moves away during that turn, it takes 1d6 + Constitution modifier thunder damage.
Increase damage to 2[W] + Intelligence modifier at 21st level.
In the Hit line, replace “start of its turn and moves away” with “start of its next turn and moves away during that turn”.
Published in Forgotten Realms Player's Guide, page(s) 27.