Medium Construct (Warforged), Neutral
Armor Class 21 (natural armor)
Hit Points 288 (24d10 + 144)
Speed 30 ft., Fly 40 ft.
STR
22 (+6)
DEX
22 (+6)
CON
22 (+6)
INT
21 (+5)
WIS
19 (+4)
CHA
13 (+1)
Saving Throws CON +11, INT +10, WIS +9, CHA +6
Skills Arcana +11, History +11, Investigation +16, Perception +14, Religion +11
Damage Resistances Bludgeoning, Force, Necrotic, Piercing, Radiant, Slashing
Damage Immunities Poison, Psychic
Senses Darkvision 500 ft., Truesight 150 ft., Passive Perception 24
Languages Deep Speech, Telepathy (cogwork only)
Challenge 16 (15,000 XP)
Proficiency Bonus +5
Traits

Cog's Sight. The cog can see through magical darkness. 

Interconnected. The cog is techno-magically connected to all other cogs. The cogs can speak and otherwise send data to each other telepathically through the cogwork.

Magic Resistance. The cog has advantage on saving throws against spells and other magically effects.

Nullification Eye. The cog's central eye creates an area of antimagic, as in the Antimagic Field spell, in a 150-foot-cone. At the start of each of its turns, the cog decides which way the cone faces and whether the cone is active.

Prismatic Core. The cog is powered by a prismatic sliver. If the cog is reduced to 0 Hit points, roll a d6. One a 1, the sliver explodes. Each creature and object within 15 feet of the cog takes 55 (10d10) Force damage. A target reduced to 0 Hit Points is disintegrated.

Actions

Multiattack. The cog makes two armblade or armrifle attacks.

Armblade. Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 17 (2d10 + 6) Slashing damage plus 17 (5d6) Force damage. A target reduced to 0 Hit Points is disintegrated.

Armrifle. Ranged Weapon Attack: +11 to hit, range 150/450 ft., one target. Hit: 33 (5d10 + 6) Force damage. A target reduced to 0 Hit Points is disintegrated.

Cognitive Blast (Recharge 5–6). Each creature within the cog’s active nullification eye area-of-effect must succeed on a DC 18 Intelligence saving throw or take 59 (10d10 + 4) Psychic damage and be Stunned for one minute. A Stunned creature can repeat the saving through at the end of each of its turns, ending the effect on a success.

Bonus Actions

Targeting Laser. The cog targets a creature or object it can see within 500 feet of it with a precise beam of blue light. Creatures with cog's sight have advantage on ranged attack rolls against the target. The laser remains until the target is behind full cover, the cog switches targets, the cog deactivates its targeting laser, or if the cog dies. The cog cannot use this bonus action if it is Blinded.

Reactions

The cog can take up to five reactions per round, but only one on each turn.

Force Field. When the cog or another creature it can see within 30 feet of it takes damage, the cog can project a force field around it. Damage the creature takes is reduced by 35 (10d6). The cog cannot use this reaction if it is Blinded.

Description

Construct of Esper. The cog is loyal to Esper and the Cognition. To prevent reverse-engineering, appendages or other pieces of the cog disintegrate when removed from it.

MKIV. The Mark 4 Cogs were created in response to the growing threat that is the Dominion of Grixis. Known to sometimes explode after destruction.

Special language. The cog knows a dialect of Deep Speech. It can be described as synthetic in sound. Additionally, there exists a written script for this dialect of Deep Speech known as Wing-Dings.

Monster Tags: construct

Habitat: Planar (Astral Plane)

PyromaniacalEvoker

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