This attack will be remembered, because it repeats itself.

Daily   ✦     Arcane, Reliable, Weapon
Standard Action      Melee weapon

Target: One creature

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

Hit: 5d10 + Strength, Dexterity, or Constitution modifier damage.

  Sustain Minor: Repeat this attack against the target. You need not be within melee reach of the target. You can continue to sustain this attack until you miss.

Published in Forgotten Realms Player's Guide, page(s) 46.