Ori and the Blind Forest: Definitive Edition

You will obtain Light Burst in the new area, Black Root Burrows. To use it, hold and a small aiming arc will appear for where your light grenade will travel in the air. Line up your shot and the torch will light up if the grenade impacts. You need to do this three times just to progress through the new area, and there are multiple new torches that lock up some collectibles around the world as well.