Enfatten

You cause up to six creatures of your choice in a 20-foot radius sphere to rapidly gain weight. Each target must succeed on a Constitution saving throw or double their weight with fat and be affected by this spell for the duration. Effected creatures clothes and armor expand to accommodate their new size.

An affected target's speed is halved due to their increased size, it takes a −2 penalty to AC, disadvantage Dexterity skill checks and Dexterity saving throws, and it can't use reactions. On its turn, it can use either an action or a bonus action, not both. Regardless of the creature's abilities or magic items, it can't make more than one melee or ranged attack during its turn.

If the creature attempts to cast a spell with a casting time of 1 action or more, they must make a raw DC 10 save. On a failed save, the spell doesn't take effect until the creature's next turn, and the creature must use its action on that turn to complete the spell. If it can't, the spell is wasted.

A creature affected by this spell makes another Constitution saving throw at the end of its turn. On a successful save, the effect ends for it.

If cast as a ritual, it can only be cast on a willing creature or one that is asleep or unconscious. The duration for the ritual lasts for 8 hours.