Siege Drill (5e Equipment)

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Wondrous Item, very rare

The siege drill is an armored, self-powered vehicle with an immense drill mounted on the front. It weighs 1200 pounds, and is powered by an arcane engine or a steam engine depending on your campaign. A hatch at the rear allows two Medium creatures to crawl inside. It is designed to dig tunnels underneath fortifications, but it might be found in use by miners or dwarves undertaking some extravagant project.

The siege drill is a huge object with the following statistics:

Siege Drill[edit]

Huge object
Armor Class: 15
Hit Points: 600
Damage immunities: poison, psychic

To be used as a vehicle, the siege drill requires one pilot. The pilot's chair has three levels, and the pilot can use their action to pull one lever with the following effects:

  1. Start machine. The drill begins to rotate, and the siege engine moves forwards at a speed of 20 feet. Pulling the lever again turns off the drill and the speed drops to 0 feet.
  2. Reverse gear. If the machinery is active, the siege engine moves backwards at a speed of 15 feet. Returning this lever to its default position returns the speed and direction back to its default.
  3. Dig. The vehicle angles itself downwards at 45 degrees, burrowing underground at a speed of 20 feet. Returning this lever to its default position causes the siege engine to dig upwards at 45 degrees until it returns to the surface. Each time the siege engine burrows, roll 1d20. On a 1, loose rock jams some part of the drill or machinery and the machinery stops as a safety precaution. A successful DC 20 Intelligence (Investigation) check from outside the vehicle (which may require excavating around it) restores its function.

The siege engine cannot steer left or right, so must be initially set in the right direction by physically turning it from outside. If the siege engine moves forwards into a space occupied by a creature, that creature can use their reaction to move 5 feet out of its path. If a creature or object is unable to move out of the way, or is forced against the drill, the following attack is made:

Huge Drill: Melee Weapon Attack: +8 to hit, range 5 ft., one target. Hit: 10d10 slashing damage.

A siege drill under ground, Source

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