Force Safe (Patreon)

Wondrous item, rare

When not in use, this device appears like a square metallic tile. It's 6 inches on either side, 2 inches deep, and weighs 2 pounds. An indentation at the center of the tile opens into a small hole. When you use an action to place a finger in the indentation, the tile magically pricks it to extract a drop of blood.

If the tile isn't activated when it draws blood, it magically activates and creates a small, 1-foot cube of magical force below it, which can be used to contain objects for safe keeping. You can tap the tile to an object small enough to fit inside the cube that isn't being worn or carried as part of this action to specify that the cube encompass only that object. The cube is immobile and impenetrable, as if by the resilient sphere spell. Its walls emit a dim green light and hum with electrical power. A creature that touches the walls of the cube takes 1d6 lightning damage.

The tile remains active until the same creature's blood is dropped into the hole, at which point the walls of force vanish. A disintegrate spell destroys the walls and deactivates the tile immediately.

The destruction of the Adamant Vault had been absolute. Layers of protective steel and stone collapsed inward or blasted to rubble, each repository's contents destroyed.

All, that is, but one. The sparking cube hovered in the center of the new crater, bright and unmarred.