Autoloading Heavy Crossbow (Icespire)

Mounted above the crossbows at a height of 6 feet is a chair equipped with pedals that causes the entire contraption to spin counterclockwise, and with levers that reload and fire the crossbows.

Bolted to the floor of this room is a rotating platform equipped with four heavy crossbows that reload automatically.

Every time it loses 10 hit points, one of its crossbows breaks.

 A creature sitting in the chair can use an action to rotate the device up to 360 degrees counterclockwise and fire up to two of its crossbows in any direction. Each crossbow makes the following attack.

Heavy Crossbow Ranged Weapon Attack: +5 to hit, range 50/200 ft., one target. Hit: 5 (1d10) piercing damage.