BACKSTAB
CommandUsage : backstab <victim>
Usage : backstab
Backstab is a way to sneak up on a person and attempt to place your dagger in his back, at exactly the point where it does most damage. A successful backstab gives a damage multiplier, depending on level.
The chance of successfully backstabbing a person depends on how well you have practiced backstab at your guild. Also, backstabbing a person will lag you for about two rounds of combat.
Full documentation: Docs Game Commands