Amber sarcophagus

The caster uses up the amber sphere and hurls it towards a creature if it is not willing it must make a wisdom save or be trapped in a amber sarcophagus which gives the creature immunity to every type of damage as well as any spells requiring them to make a save and the target is in stasis until the spell ends or the sarcophagus is destroyed.

The sarcophagus has a 15 ac and has immunity to necrotic, non magical bludgeoning piercing and slashing damage, radiant damage or psychic damage and has 200 hit points. 

On a successful save the target avoids the spell and it fails.