Anima Gemma

Sealing will involve an item called Anima Gemma that can lock away any being in a prison realm contained within the gem. Mechanically staring at a dc 10 charisma save and the dc increasing by 2 for every 50 damage below its max hp. To a max of 30. If a creature succeeds on a 30 dc save from the gem it cannot be trapped for a full 24 hours.