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Umbra and Nyx, Shadowstalker Psions - AI-generated fantasy Monster

Umbra and Nyx, Shadowstalker Psions

Nyx emerged from the void between dimensions centuries ago and built a hidden empire beneath the city. She learned to convert victims into extensions of her hunting network, but most of her creations were unstable. Umbra was created only days ago from a concentrated fragment of Nyx's essence and immediately displayed greater efficiency, restraint, and tactical intelligence. Nyx views Umbra as both daughter and potential replacement. Umbra views Nyx as a valuable source of knowledge whose eventual defeat is an inevitability.

LargeHumanoid(Psionic shapeshifter)CR Deadly, suitable as a paired boss encounter for a level 20 partyNeutral Evil

Umbra and Nyx, Shadowstalker Psions

urban horrorpsionicshadowhumanoidlurkerapex predatortelepathboss encounterduo encounter
HP315AC+13 melee, +14 ranged spell attackSPDFly 50 ft. hover, Climb 40 ft., Can move across vertical surfaces and ceilings without ability checksCR22 (41,000 XP)AcrobaticsDeceptionInsightPerceptionStealthInvestigation
STR
22
DEX
24
save
CON
20
INT
22
save
WIS
22
save
CHA
22
save
Shadow Flight. Umbra does not provoke opportunity attacks when she flies out of an enemy's reach if she begins her movement in dim light or darkness.
Incorporeal Passage. Umbra can move through a space as narrow as 1 inch wide without squeezing. She can also move through creatures and objects as if they were difficult terrain. If she ends her turn inside an object, she takes 22 () force damage and is shunted to the nearest unoccupied space.
Legendary Resistance. Umbra has advantage on saving throws against spells and other magical effects. She has three uses of Legendary Resistance per day. If she fails a saving throw, she can choose to succeed instead.
Psionic Defiance. Umbra has advantage on saving throws against being charmed, frightened, stunned, or incapacitated. She is immune to any effect that would read her thoughts unless she permits it.
Shadow Meld. While in dim light or darkness, Umbra has advantage on Dexterity (Stealth) checks and can attempt to hide even when only lightly obscured. Bright light suppresses this benefit.
Shared Predation. Umbra can communicate telepathically with Nyx while they are within 1 mile of each other. While both are conscious and within 120 feet, they cannot be surprised, and each has advantage on attack rolls against a creature that the other psion has damaged during the current round.
Feed on Collapse. When Umbra reduces a creature to 0 hit points with psychic damage, she gains 20 temporary hit points and can immediately move up to half her flying speed without provoking opportunity attacks.
Shadow Matrix. A female humanoid that survives three consecutive days of exposure to Umbra's shadow matrix may become a viable vessel for a new Shadowstalker Psion. The transformation requires substantial psychic energy, is subject to the GM's narrative control, and is not an automatic result of combat or ordinary contact.
Perfect Ambush. Umbra has advantage on initiative rolls. On the first round of combat, she can take one additional reaction, but can use it only for Reflexive Dissolution.
Multiattack. Umbra makes three attacks, using Shadow Talon or Psionic Rend in any combination.
Shadow Talon. Melee Weapon Attack: to hit, reach 10 ft., one target. Hit: 15 () slashing damage plus 13 () psychic damage. If the target is frightened, grappled, restrained, or charmed by the psion, it takes an additional 9 () psychic damage.
Psionic Rend. Ranged Spell Attack: to hit, range 120 ft., one creature. Hit: 27 () psychic damage, and the target must succeed on a Intelligence saving throw or be unable to take reactions until the end of its next turn.
Predator's Gaze. One creature Umbra can see within 90 feet must make a Wisdom saving throw. On a failure, the target takes 36 () psychic damage and is frightened for 1 minute. On a success, it takes half damage and is not frightened. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.
Eclipse Burst. Umbra targets a point she can see within 120 feet. Shadows erupt in a 20-foot-radius sphere. Each creature in the area must make a Dexterity saving throw, taking 45 () necrotic damage plus 22 () psychic damage on a failed save, or half as much damage on a successful one. The area becomes heavily obscured by supernatural darkness until the start of Umbra's next turn.
Efficient Consumption. Umbra targets one humanoid within 60 feet that is frightened, charmed, incapacitated, or below half its hit point maximum. The target must succeed on a Constitution saving throw or take 55 () psychic damage and become stunned until the end of Umbra's next turn. If the target dies from this damage, Umbra gains 30 temporary hit points.
Shadow Step. Umbra teleports to an unoccupied space she can see within 60 feet that is in dim light or darkness. Each creature within 10 feet of the space she leaves must succeed on a Wisdom saving throw or be frightened until the end of its next turn.
Reflexive Dissolution. When Umbra is hit by an attack while in dim light or darkness, she halves the attack's damage and teleports up to 30 feet to an unoccupied space she can see that is also in dim light or darkness.
Calculated Failure. When a creature Umbra can see within 60 feet succeeds on a saving throw against one of her psychic effects, Umbra forces it to reroll the save. The creature must use the new result. Umbra can use this reaction once per round.
Predatory Reposition. Umbra moves up to half her flying speed without provoking opportunity attacks. She can move through a creature's space if that creature is frightened, but cannot end there.
Psychic Distruption. One creature Umbra can see within 60 feet must succeed on a Wisdom saving throw or subtract from the next attack roll or saving throw it makes before the end of its next turn.
Shadow Strike (Costs 2 Actions). Umbra makes one Shadow Talon attack or uses Shadow Step.
Compelled Motion (Costs 2 Actions). Umbra chooses a creature within 90 feet that is frightened or charmed. That creature must use its reaction, if available, to move up to half its speed in a direction Umbra chooses.
Mind-Harvest Pulse (Costs 3 Actions). Umbra uses Predator's Gaze or Psionic Rend.
Cantrips
Mage HandConjuration Umbra can cast these spells without material components, using Intelligence as her spellcasting ability.
2nd level
Innate PsionicsEnchantment At will: detect thoughts, disguise self, minor illusion, misty step, silent image.
4th level
Innate PsionicsEnchantment 3/day each: dimension door, fear, greater invisibility, hypnotic pattern, modify memory.
5th level
Innate PsionicsEnchantment 1/day each: dominate person, synaptic static, teleport.
8th level
Innate PsionicsEnchantment 1/day: power word stun.
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