Dragons Furnace

After casting the spell, the spectral visage of a red dragons head made entirely out of force traps your targets whole body within its jaws, creating a prison for the target just big enough for them to fit within the beasts maw

the dragons head, is a solid barrier that prevents any matter from passing through it and blocking any spells cast into or out from the area. Additionally, when fist bound in the dragons jaws, the target takes 3d10 piercing damage and 5d10 fire damage as the dragon fills its closed mouth with flame. Each time,  at the end of the targets turn, they sustain the fire damage again however each time after the time they it happens after the first, an additional 2d10 fire damage is added. the dragon can also be instructed to move up to 30 feet in any direction at the end of your turn. additionally the flames of the dragon burn so hot that resistance to fire damage is ignored

When you cast the spell, any creature that is completely inside the heads area is trapped. Creatures only partially within the area are pushed away from the center of the area until they are completely outside the area.

A creature inside the mouth can't leave it by nonmagical means. If the creature tries to use teleportation or interplanar travel to leave the dragons jaws, it must first make a Charisma saving throw. On a success, the creature can use that magic to exit the beasts bite. On a failure, the creature can't exit the cage, suffers 3d10 piercing damage, and wastes the use of the spell or effect. The dragons grasp also extends into the Ethereal Plane, blocking ethereal travel.

This spell can't be dispelled by dispel magic.