Dude's Ex Mach Nine...Uh

Choose one target within range that has an Ex. Invoking the name of that creatures ex, you summon their Ex across space and the planes so that they will arrive travelling at Mach nine towards the target. That target must make a Dexterity saving throw with disadvantage. On a failed save, the Ex strikes the target and stops moving. On a successful save, the Ex strikes off of the target and lands 10 feet away with the target taking half damage. When the Ex strikes the target, the target it strikes takes 1d12 force damage for each 10 pounds of the Ex's weight, with a minimum of 10d12, rounding up the body weight. No matter whether the target succeeds or fails the save, they also takes 4d4 psychic damage ignoring resistances and still doing half damage against immunities.