Throne of Want

This spell creates a magical throne in the space occupied the caster who is forced to sit, a dome of force extends around the throne and caster. The design of the throne is up to the caster but can be no larger than seven feet. While seated the caster's movement speed is reduced to 0, they have disadvantage on dexterity saves, their AC is increased by 2 and their spell save DC and spell attack modifier is increased by 1.

The AC of the caster is increased by 1 when the spell is cast at 6th level and the spell save DC and spell attack modifier is increased by 1 when cast at 8th level