Rifle Slits. 3 rifle slits and racked aberrant rifles line each side of the carriage. A rifle may be readied or stored as a bonus action at each slit, and fired as an action. Charging station for rifles (powered by large box in floor) at each stored location.

Armored Dual Aberrant Rifle Turret. A 3' high iron wall encircles a seated turret mounted atop the carriage equipped with 2 repeating crossbows. Provides 1/2 cover (+3 AC) to operator.

Carriage Front Armor. A 3' high iron wall wraps around the front bench of the carriage, and an iron canopy extends over the front bench. Provides 1/2 cover (+3 AC) to driver & shotgun rider.

Bullseye Lanterns.  3 lanterns mounted on each side (above arrow slits) and 1 at the front bench. Installed in a way that allows lighting & refilling from inside the carriage. 

Boudica Spikes.  Spikes installed on each wheel of the carriage.

Fireproofed Wood.  Carriage has fire resistance.

Barded Warhorses.  Carriage is drawn by 6 warhorses with an AC of 15.

Rear Caltrop Trap. Release 80 caltrops from a compartment behind the carriage. Cover a 10-foot-square area. Any creature that enters the area must succeed on a DC 15 Dexterity saving throw or stop moving and take 1 piercing damage. Until the creature regains at least 1 hit point, its walking speed is reduced by 10 feet. A creature moving through the area at half speed doesn't need to make the saving throw. 1 minute, stationary, to reload. Caltrops stored beneath interior benches.

Rear Grease Trap. Slick grease covers the ground in a 10-foot square area and turns it into difficult terrain. When the grease is released, each creature standing in its area must succeed on a DC 15 Dexterity saving throw or fall prone. A creature that enters the area or ends its turn there must also succeed on a Dexterity saving throw or fall prone. 1 minute, stationary, to reload. Grease stored beneath interior benches.

Trample. Melee Weapon Attack: +5 to hit, reach 5 ft., 1-4 target. Hit: 10 (4d4 + 4) [bludgeoning] damage. 

Dual Aberrant Rifle Turret. RangedWeapon Attack: +6 to hit, range 80/120 ft., 2 target. Hit: 10 (3d4 + 4) [force] damage.

Aberrant Rifle. RangedWeapon Attack: +6 to hit, range 80/120 ft., 1 target. Hit: 10 (3d4 + 4) [force] damage.

Batten the Hatches. An iron set of rear doors may be locked as an action. Cannot be unlocked from the outside.