Sable Trench, Sablecoast
unknown

The apparatus arrived in Grimharbor in the hold of a salvage vessel working the wrecks of Chain Bay. For several seasons it was put to use recovering cargo from depths no diver could reach. The crew's last confirmed commission took them toward the Sable Trench. The vessel returned to port. The crew did not.
Wondrous item, legendary — requires attunement (Dungeon Master's Guide)
This item first appears to be a Large sealed iron barrel weighing 500 pounds. A hidden catch — found with a successful DC 20 Intelligence (Investigation) check — releases a hatch at one end. Two Medium or smaller creatures can crawl inside. Ten levers in a row at the far end, each in a neutral position, can move either up or down. When operated, the apparatus transforms to resemble a giant lobster.
AC 20 · HP 200 · Speed 30 ft., swim 30 ft. (or 0 ft. for both if legs and tail are not extended) · Damage Immunities poison, psychic
The compartment is airtight and watertight when the hatch is closed, and holds enough air for 10 hours of breathing divided by the number of breathing creatures inside. The apparatus floats on water and can submerge to a depth of 900 feet. Below 900 feet, it takes 2d6 bludgeoning damage per minute from water pressure.
One creature must pilot the apparatus. A creature inside can use an action to move up to two levers. Each lever returns to its neutral position after each use.
| Lever | Up | Down |
|---|---|---|
| 1 | Legs and tail extend, enabling movement | Legs and tail retract, speed becomes 0 |
| 2 | Forward window shutter opens | Forward window shutter closes |
| 3 | Side window shutters open | Side window shutters close |
| 4 | Two claws extend from the front | Claws retract |
| 5 | Each extended claw attacks: +8 to hit, reach 5 ft., 7 (2d6) bludgeoning damage | Each extended claw attacks: +8 to hit, reach 5 ft., target grappled (escape DC 15) |
| 6 | Apparatus moves forward | Apparatus moves backward |
| 7 | Apparatus turns 90 degrees left | Apparatus turns 90 degrees right |
| 8 | Eye-lights emit bright light in 30 ft. radius and dim light for 30 ft. beyond | Lights off |
| 9 | Apparatus sinks up to 20 ft. in liquid | Apparatus rises up to 20 ft. in liquid |
| 10 | Rear hatch unseals and opens | Rear hatch closes and seals |
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