Animated Throne

Antimagic Susceptibility. The throne is incapacitated while in the area of an antimagic field. If targeted by dispel magic, the armor must succeed on a Constitution saving throw against the caster's spell save DC or fall unconscious for 1 minute.

False Appearance. While the throne remains motionless, it is indistinguishable from a royal throne.

Multiattack. The throne makes two melee attacks.

Float. The throne rises 15 feet in the air. If the throne doesn't use crush on its next turn, the throne floats back down until it reaches solid ground.

Crush. The throne can only use this attack if it used Float on its last turn. The throne moves up to 10 ft, then slams downward with sudden speed. Any creatures underneath the throne take 16(2d12+3) bludgeoning damage and are knocked prone. They are pushed out of the throne's space. The throne cannot take movement before or after this attack.

Slam. Melee weapon attack, 5ft. reach, 1 target, +7 to hit. Hit: the target takes 11(2d6+4) bludgeoning damage and must succeed on a DC 14 Strength saving throw or be knocked prone. 

Barbed Chain(Recharge 5 -6). The throne opens its mouth, shooting out a bloodied, barbed chain in a thirty foot line originating from the throne. Each creature in that area must make a DC 15 Dexterity saving throw, taking 31 (7d8) piercing damage on a failed save, or half as much damage on a successful one.