Trap the soul

You trap the body and soul of a creature in a gem until the gem is broken or the spell is ended. If the creature is from another plane it can be given an immediate task to complete before returning to it's home plane, otherwise the creature can just go free. There are two ways to cast this spell.

Spell completion

You use an action to say the last word of the spell allowing a wisdom save, if the creature's name is spoken the save DC is increased by two, if the save is successful the gem shatters.

Trigger object

The gem is inscribed with the final word of the spell along with the creature's name, this gives the target disadvantage on the save.