Wondrous Item, varies
The amber prison is an item that can store creatures in a stasis. The max CR varies based on rarity. It can only store 1 creature at a time, and the user can choose to release them at any time. When released it does not change the creatures alignment, or temperament. They prison will also stop working when the user dies.
Max CR is as listed
Common- CR1 or less
Uncommon- CR3 or less
Rare- CR5 or less
Very Rare- CR7 or less
Legendary- CR 9 or less
Artifact- CR 11 or less
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