Earthen Dome

A dome of hardened earth encloses a creature or object of Large size or smaller within range. An unwilling creature must make a Dexterity saving throw. On a failed save, the creature is enclosed for the duration.

If cast as a ritual, a 10-foot-radius immobile dome of hardened earth springs into existence around and above you and up to 8 other creatures of Medium size or smaller and remains stationary for the duration. The spell ends if you leave its area. This lasts for up to 8 hours.

The dome is 3 inches thick and has an AC of 18 and 200hp, and is vulnerable to Thunder damage.