From Destinypedia, the Destiny wiki
- "A grenade that creates a horizontal wall of burning Void Light."
- — In-game description
Void Walls are a type of Void Grenade Ability. The grenade bounces off walls and creatures, but detonates instantly on contact with the ground, unleashing a horizontal stream of Void flames in opposite directions. These flames linger in the area and damage any foe caught in them.