A Verbal that causes characters to fall down. From the Accelerant core rules:

"Some great force knocks you back and off your feet. When you are struck with this effect you role play an extremely forceful blow or blast. You may take up to three steps backwards and fall down. The steps backward are optional. The effect ends when your chest or back touches the ground. If falling to the round is an issue due to ground quality, crowding or health you may opt to instead take your steps, drop to a knee and place both hands palm down on the ground and shake your head for three seconds."

"Some Slam effects are so powerful they knock you back through a shield. If you hear "Shield Slam" it works even if it strikes your shield. This attack can be blocked by a weapon and would count as a strike to the limb holding the shield."