Analor's Iron Maiden

You reach out and summon an ethereal iron maiden around a target. The creature must make a Dexterity Saving Throw or be restrained and take 2d8 piercing damage. On a success, the creature is released. On each fail, the target takes an additional 1d6 piercing.

While captured, the creature can attempt to escape at the end of every turn with a Strength Saving Throw.

At Higher Levels: when cast at 5th level or higher, the initial damage increases by 1d8, and the secondary damage by 1d6 for every two levels above 3rd.