Your blood runs up your blade toward your foe, becoming tinged a sickly green as it inches toward your foe's wound.

Encounter   ✦     Arcane, Necrotic, Weapon
Standard Action      Melee weapon

Target: One creature

Attack: Strength vs. AC, Dexterity vs. AC, or Constitution vs. AC

Hit: 1[W] + Strength, Dexterity, or Constitution damage + 2d6 necrotic damage. You regain hit points equal to twice the necrotic damage you dealt.

Published in Forgotten Realms Player's Guide, page(s) 43.