Toppling Charge

You enlarge your form and rush forward like an unstoppable force.  You become one size category larger for this instance, and you rush forward in a line up to 40 feet (this movement does not provoke attacks of opportunity).  Any creatures caught in this line must make a dexterity saving throw or take 6d12 bludgeoning damage and fall prone on a failed save.

Casting at Higher Spells. When you cast this spell using a spell slot of 6th level or higher, the damage increases by 1d12 for every two slot levels above 4th as your size category increases by one to a maximum of gargantuan.  Your movement gained from this spell also increases by 10 feet.