Archibald's Toppling Dominoes

You raise a Domino in your hand channeling magic into it and imagine it toppling forward, evoking the force of a giant domino falling down on every unfortunate creature caught in it's path. Each creature in a 100 foot long and 5 foot wide line originating from you must make a Strength saving throw. A creature takes 4d10 force damage on a failed save and is knocked prone. On a successful save, a creature takes half as much damage and isn’t knocked prone. If a creature has another creature affected by this spell directly in front of it, it has disadvantage on the Strength save.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d10 for each slot level above 3rd.