Cube of Force

Cube of Force is a magic item (wondrous item) of rare rarity.

Cube of Force — fantasy item illustration. Cube of Force is a magic item (wondrous item) of rare rarity.
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This inch-long cube has a recessed button with a distinct marking on each face. It starts with 36 charges and regains 1d20 of them at dawn.

You can use an action to press one of the buttons, expending charges as shown on the Cube of Force table. If the cube has insufficient charges, nothing happens.

Otherwise, the cube creates a 15-foot cube of force that is centered on you and moves with you. It lasts for 1 minute, until you use an action to press another button, or the cube’s charges are depleted.

You can change the cube’s effect by pressing a different button. Doing so expends the requisite number of charges and resets the duration.

If moving causes the cube to come into contact with a solid object that can't pass through the cube, you cannot move any closer to that object while the cube is active.

The cube loses charges when targeted by effects from the following spells or magic items: disintegrate (1d12 charges), _horn of blasting (1d10 charges), _passwall (1d6 charges), _prismatic spray (1d20 charges), _wall of fire (1d4 charges).

_Table: Cube of Force_
| Face | Charges | Effect |
| -------- | ----------- | ------------------------------------------------------------------------------------------------------- |
| 1 | 1 | Gasses, wind, and fog can’t penetrate the cube. |
| 2 | 2 | Nonliving matter can’t penetrate the cube, except for walls, floors, and ceilings (at your discretion). |
| 3 | 3 | Living matter can’t penetrate the cube. |
| 4 | 4 | Spell effects can’t penetrate the cube. |
| 5 | 5 | Nothing penetrates the cube (exception for walls, floors, and ceilings at your discretion). |
| 6 | 0 | Deactivate the cube. |

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Further reading

Jetpack7 Game Master Series
The Game Master's Book of Random Encounters
Jeff Ashworth · 2020
The Game Master's Book of Traps, Puzzles and Dungeons
Jeff Ashworth · 2022
Last updated 6/19/2026·Tags: item, wondrous item, rare