Asier's Searing Shackles

You summon fiery chains from the ground that trap a creature of large or smaller within range. The creature must make a dexterity saving throw or take 2d6 fire damage and is restrained for the spell’s duration.

At the start of their turn, the creature makes a Constitution saving throw or takes 2d6 fire damage, half as much damage on a successful one.

To break out, the creature must make a Strength check against your spell DC at the end of their turn. On a success, the spell ends.