You cast Punching Down more easily, and the blow weakens your enemies, causing them to do less damage.
Punching Down is a Mage ability from the Rift Mage Specialization in Dragon Age: Inquisition.
About Punching Down
Punching Down is an upgrade to Veilstrike which reduces the cost and adds a weakened effect to affected enemies, lessening their damage output.
Notes and Tips
Rift Mage Ability Tree