Shiv

Shiv is a Rogue ability learned at level 70. It is used to instantly apply the poison from the Rogue's offhand weapon or to dispel an Enrage effect. Its energy cost depends on the speed of the offhand weapon used.

Energy cost
The energy cost of the ability depends on the speed of the off-hand weapon: 20 + (10 * weapon speed) = Energy consumption So, with a 1.8 speed off-hand: 20 + (10 * 1.8) = 38 energy