Wrecking Blow is a Weapon skill, found in the Two Handed Skill line. A powerful spammable for 2H Stamina DPS builds in PVE.

Wrecking Blow
2700 0,8s Cast Target: Enemy Base Skill: Uppercut
Slam an enemy with an upward swing, dealing 2760 Physical Damage. Grants you Empower for 5 seconds, increasing the damage of your Heavy Attacks against monsters by 80%.

Wrecking Blow is a morph of the Uppercut base skill. The other morph is Dizzying Swing. A good option for Stamina based PVE Builds.