Robot, Annihilator

Family: Robot

Gargantuan construct (robot), unaligned

Armor Class 20 (natural armor)
Hit Points 290 (20d14+140)
Speed 50 ft.

24 (+7) 24 (+7) 24 (+7) 13 (+1) 14 (+2) 10 (+0)

Damage Resistances cold, fire; bludgeoning, piercing, and slashing damage from nonmagical weapons that aren’t adamantine.
Damage Immunities necrotic, poison, psychic
Condition Immunities charmed, exhaustion, frightened, paralyzed, poisoned, stunned
Senses darkvision 60 ft., passive Perception 12
Languages Common
Challenge 16 (15,000 XP)


  • Positioning Jets (Recharges 4-6). The annihilator can levitate (as the spell) up to 50 feet up or down or gain a swim speed of 100 feet until its next turn.
  • Relay Form. The communications relay robot acts as a telecommunications array, guarding the connection between linked hubs elsewhere on the planet within 100 miles when active and moving. It also can anchor itself into place and extend its antennae and sensor arrays. It is treated as restrained when doing so but gains blindsight with a range of 300 feet and increases the range of its communications gear to 1,000 miles. It takes 1d3 rounds to retract its anchors and antennae and resume moving.


  • Multiattack. The robot makes 2 Chain Guns attacks or 2 Slam attacks.
  • Chain Guns. Ranged Weapon Attack: +12 to hit, range 100/200. Hit: 35 (8d6 + 7) piercing damage. The robot may instead opt to make 1 Chain Guns attack against every target in a 100 ft. cone
  • Plasma Lance (Recharges 5-6). All creatures in a 120 ft. line suffer 35 (10d6) fire damage and 35 (10d6) lightning damage.
  • Slam. Melee Weapon Attack: +12 to hit, 20 ft. reach. Hit: 21 (4d6+7) bludgeoning damage.


  • Braking Jets. If an annihilator falls, as a reaction it can use its positioning jets to slow its fall as if it had cast feather fall. It cannot use this ability if its positioning jets have not recharged.


The enormous and formidable annihilator robots roam old ruins and wastelands, ridding them of all life and civilization. They smash structures, slaughter creatures both sentient and bestial, and scorch plant life to ashes.

When rampaging, an annihilator indiscriminately destroys rather than following the meticulous approach many other robots take with their work. Despite the destruction they wreak, annihilators often gather up those who survive their assaults, collecting the dying and unconscious from battlefields and bringing them to a set location. Their purpose for keeping these battered but still-living prisoners is unknown.

Communications Relay. Some annihilators are created as key communications hubs or parts of distant early-warning systems, using their built-in weaponry to protect the network from saboteurs and their mobility to enable clear communications in hostile environments.

Section 15: Copyright Notice

Mechanical Monsters (5E) © 2023, Legendary Games; Authors: Jason Nelson, Miguel Colon, Robert J. Grady, Nicholas Hite, Matt Kimmel, Michael Mifsud, James-Levi Cooke, Dan Dillon, Mike Myler, Ismael Alvarez, Jeff Lee, John Lynch.

This is not the complete section 15 entry - see the full license for this page