Vengeance from beyond the Grave
Habitat: Forest, Swamp, Urban; Treasure: Any
Haunting revenants possess ruins and forsaken places connected with their deaths—such as abandoned buildings, wrecked ships, or junk heaps. These revenants lurk in plain sight, waiting for their foes to near, then trap their victims within their massive bodies. Those inside a revenant might be battered by animate furnishings or more unsettling manifestations of the revenant’s hatred.
Wrathful spirits bent on revenge, revenants possess corpses and other materials, using them to seek justice or vent their rage on those who wronged them. Revenants refuse to rest until those they seek to punish are no more. If their bodies are destroyed, revenants claim new forms and continue their ruthless quests.
Haunted Zone. Constitution Saving Throw: DC 17, any creature that casts a spell while inside the revenant’s space. Failure: The spell fails and is wasted.
Undead Restoration. If the revenant dies, it revives 24 hours later unless Dispel Evil or Good is cast on its remains. If it revives, it animates another Gargantuan object or structure 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 revenant makes two Object Slam attacks and uses Invitation.
Object Slam. Melee or Ranged Attack Roll: +9 (with Advantage if the target is inside the revenant’s space), reach 10 ft. or range 30/90 ft. Hit: 27 (5d8 + 5) Bludgeoning damage.
Invitation. Charisma Saving Throw: DC 17, each creature in a 60-foot Cone. Failure:
The target is teleported inside the revenant’s space and swallowed. A
swallowed creature has Total Cover against attacks and other effects
outside the revenant.
While the revenant has Hit Points, a swallowed
creature can leave the revenant’s space only by using magic that
enables planar travel, such as the Plane Shift spell.