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• Playstation®: NA and EU megaservers for patch maintenance – March 26, 6:00AM EDT (10:00 UTC) - 12:00PM EDT (16:00 UTC)
An execute ability (aka finisher) is an ability that you can use (either it be a class/guild/weapon ability) to "finish" off an opponent quickly, usually when the enemy is at 25% health or below.
An example would be the Nightblade's "Killer's Blade" ability or the Templar's "Radiant Oppression".
Any ability in general with increased damage at low health is considered an execute. I'm pretty sure once you get to 25% hp with any duel wield skill, they classify as execute's too. I believe steel tornado count's as an execute at 50% hp before it hit's the 25% health mark for the passive damage increase.
I'll assume the set your using is the new Venom or Toxic set. Not sure which. It's great for Nightblade's who Poison Injection or Stamina Sorc's who Steel Tornado.