Slice Reality [three-actions] Spell 6

You slice through reality, forming a chasm of life-draining entropy in a straight line 20 feet high, 120 feet long, and 2 inches thick. The chasm provides cover. The chasm deals 7d8 void damage to each creature that's in the chasm's space when it's created, that attempts to pass through thechasm, or that ends its turn inside the chasm, with a basic Reflex save. A creature that succeeds at this save when the chasm is created is pushed to the nearest space on the side of its choice. Creatures trying to move through the chasm fail to do so if they critically fail the save, ending their movement next to the chasm.