Sequestration Pane

Wondrous Item - legendary 

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A panel, slightly curved, of deep blue glass. Around half a metre on each side and two inches thick, heavy and unwieldy, the edges sealed and gilded in fine, leaf-thin metal. Alchemically treated in a manner nearly impossible to recognize, staring into the glass one could almost get lost in its depths.
A fully sealed and independent Sequestration Pane such as this is a smaller part of a whole, a test platform used as a trial run for a large, much more complex magical engine. It holds less power than the Sleeping Sun, but is capable of functioning isolated from other devices, if properly used, and could be of use in its repair. Over the course of 1 hour, it may be used as a spell component to permanently imprison a creature.
This functions as the spell imprisonment, but with the following conditions:

The casting time is increased to 1 hour, the Pane is used as the material component, and the spell is cast with the Hedged Prison variant.

The target must be a creature present for the entire duration

A creature leading the ritual must succeed on a DC 19 spellcasting ability modifier check, or the process fails.

The spell is cast with a DC 22 saving throw, and the process fails as per normal if the target succeeds.

If the process succeeds then three willing creatures present, one of whom must be the ritual's leader, must expend a spell slot of at least 5th level or higher, or the process fails.

After being used to imprison a creature once, it cannot be used again without releasing the original creature. If the panel is broken, any creature within is release.

Item type

Magical