JudasIscariot: Nah, it's some lightning-based attack, I forgot the name atm :)
Hunter65536: Ah, that's lightning nova. Pretty nice as well, but ground stomp is better. Posting stats for comparison.
Ground Stomp
38 Energy Cost
12 Second Skill Recharge
4 Meter Radius
30% Weapon Damage
161-288 Physical Damage
80 Internal Trauma Damage Over 2 Seconds
25% Slow target For 3 Seconds
Lightning Nova
38 Energy Cost
4 Meter Radius
18% Weapon Damage
22-108 Lightning Damage
Notice how there is no skill recharge? :P I can simply tap the mouse twice in rapid succession to get the same effect in about a second or less :P