Power Impact is an energy wave technique utilized by Jiren.
The user pulls their hand back, charging a red energy blast, and then pushes their hand forward, firing the attack. The user can also guide the attack where ever they choose.
Jiren then tried to attack Brianne de Chateau with this technique but Vegeta beat him to it.
Video game appearances
The move appears as Jiren's super attack in Dragon Ball Heroes. The exact same move was also used by Jiren to knock Kale out of her Berserk form.