Homebrew (updated older edition)
7-level Conjuration
You open portals from the eternal battlefields of the plane of Acheron, stealing a salvo from its unceasing mangonels. When you cast the spell, select four points within a 100-foot cube adjacent to you. Each point must be at least 20 feet away from another. Creatures within 5 feet of any of these points must make a Dexterity saving throw. A creature takes 8d10 bludgeoning damage on a failed save, or half as much damage on a successful one, as a mangonel stone strikes the targeted area. Objects and structures take double damage from this spell.
When you cast this spell using a spell slot of 8th-level or higher, your spell summons one additional mangonel stone, allowing you to select another point within the cube's area for each slot above 7th.
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