Source: Arcana Unleashed
Wondrous Item, Very Rare
When this 3-inch-diameter metal ball is activated as a Magic action, it moves at a rapid speed, bouncing off walls and defying any attempts to capture it. The ball remains active for 1 minute or until you deactivate it by using a command word while within 30 feet of it (no action required). Once the ball is used, it can’t be used again until the next dawn.
When you activate the ball and at the beginning of each of your turns while the ball is active, each creature in the area makes a Dexterity saving throw, taking Bludgeoning damage on a failed save. The save DC and amount of damage dealt depend on the approximate size of the area in which the ball is active, as shown on the following table.
| Area | Save DC | Bludgeoning Damage |
|---|---|---|
| 15-foot Cube | 18 | 6d6+5 |
| 30-foot Cube | 17 | 4d6+4 |
| 50-foot Cube | 15 | 2d6+2 |
| 100-foot Cube | 14 | 1d6+1 |
A nonmagical object that isn’t being worn or carried also takes the damage if it is in the area. In confined areas larger than a 100-foot Cube, the amount of damage caused by the ball is negligible. If the ball is activated in an unconfined area, it flies off in a random direction at a rate of 300 feet per round.