Beached Whale

You imbue a creature within range with fattening magic. The creature must succeed on a Constitution saving throw or gain 500 pounds. The creature also becomes restrained for the duration of the spell. Whenever the creature starts its turn while the spell is active, they gain an additional 100 lbs.

At Higher Levels: When you cast this spell in a slot of 6th level or above, the initial weight gain increases by 100 pounds.