Regeneration. The walker regains 15 Hit Points at the start of each of its turns while standing in water. If the walker takes Radiant damage, this trait doesn’t function at the start of its next turn. Its body is destroyed only if it starts its turn with 0 Hit Points and doesn’t regenerate.

Undead Restoration. If the walker dies, it revives 24 hours later in a different shipwreck unless Dispel Evil and Good is cast on its corpse. If it revives, it reshapes and animates a shipwreck elsewhere on the same plane of existence; it now looks different but uses the same stat block and returns with all its Hit Points.

Multiattack. The walker makes two Slam attacks or one Slam attack and one Anchor Toss attack.

Slam. Melee Attack Roll: +7, reach 5 ft. Hit: 8 (1d8 + 4) Bludgeoning damage plus 2 (1d4) Necrotic damage.

Anchor Toss. Ranged Attack Roll: +5, reach 15 ft. Hit: 11 (2d6 + 4) Bludgeoning damage.

Last Moments. A cylinder of ethereal water 40 feet high with a radius of 20 feet manifests in a location the walker can see within 60 feet. Constitution Saving Throw: DC 13, each creature in a 20-foot-radius, 40-foot-high cylinder. Failure: the creature loses 1 minute of breath. Failure or Success: The area is considered to be underwater (though no actual water appears) as long as the walker maintains concentration on this effect (as though it were a spell). A Shadow rises from the corpse of any Humanoid that dies in this effect. The shadow is under the walker’s control and shares the walker’s Initiative count but acts immediately after the walker. The walker can end this effect at will.

Baleful Rigging. Dexterity Saving Throw: DC 14, one target within 30 feet. Failure: The target has the Grappled condition (escape DC 16). Until the grapple ends, the target is pulled 10 feet towards the walker at the start of each its turns. If a corpse is grappled by this effect, the walker regains hit points equal to a roll of all of that creature's hit dice as it is subsumed into the walker.