Dr. Flumph's Miniature Catapult

You place the miniature catapult/pendant with the marble in a space directly in front of you, and it turns into four Tiny catapults within a 5x5 foot square for the duration. You can give it a command word (such as “Fire”) or give it a trigger (such as “Any creature that approaches will be attacked” or “if anything touches this item, kill it”). Once you say the command word or the conditions are met, all targets within 30 feet of the catapults during the duration must make a Dexterity saving throw with your spell save DC. On a failed save, the target takes 4d6 bludgeoning damage, or half as much on a success. Any creature that remains in range or moves into range must make the saving throw the first time they enter and every round they remain in range.

The catapults can be attacked. They have AC 10, 5 hit points each, and for each miniature catapult destroyed, the damage taken by all targets is reduced by 1d6.

If you cast this spell on the same spot for 24 hours, they will stay for 1 year or until they are destroyed, whichever comes first.

At Higher Levels. When you cast this spell using spell slots higher than 2nd, four more catapults appear in a 5-foot square adjacent to the other(s) and adding an additional 4d6 bludgeoning damage for every two spell slots above 2nd.