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Umbracyst, the Gloommire Wyrm - AI-generated fantasy Monster

Umbracyst, the Gloommire Wyrm

Underdark legends say Umbracyst hatched beneath a dead star that fell into the earth and turned to crystal. Whether born of ancient dragon blood, abyssal influence, or the hunger of the deep itself, it learned that fear is the best currency underground. Drow, duergar, myconids, and deep gnomes all tell different versions of the same warning: when the cavern lights dim without reason, the Gloommire Wyrm is already hunting.

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GargantuanDragon(Dragon)CR 30Chaotic Evil

Umbracyst, the Gloommire Wyrm

dragonunderdarksolo bosslegendarynecroticdarknessflyingburrowinggargantuan
HP615AC22SPD40 ft. walking, 40 ft. burrowing, 40 ft. climbing, 80 ft. flyingCR30PerceptionStealthIntimidationInsightArcana
STR
30
save
DEX
12
save
CON
30
save
INT
18
save
WIS
18
save
CHA
24
save
Cave-Stalker. Umbracyst has advantage on Dexterity (Stealth) checks made in dim light, darkness, or natural subterranean terrain.
Legendary Resistance. If Umbracyst fails a saving throw, it can choose to succeed instead. It can do so three times per day.
Mythic Burrow. Umbracyst's attacks count as magical. It can burrow through solid rock and magically shaped crystal without leaving a tunnel that can be easily followed, though the passage may collapse behind it at the DM's discretion.
Dimming Aura. The dragon's presence suppresses mundane light. Nonmagical flames within 120 feet of Umbracyst burn dimly and shed only half their normal light unless protected or enclosed.
Gloam Veil. When a creature Umbracyst can see hits it with an attack, it imposes disadvantage on one attack roll against it by shrouding itself in refracting gloom.
Shadow Step. Umbracyst makes one Claw attack or moves up to half its speed without provoking opportunity attacks.
Tail Sweep (Costs 2 Actions). Umbracyst lashes out with its Tail attack and each creature of its choice within 10 feet must succeed on a Strength saving throw or be pushed 10 feet and knocked prone.
Draining Exhalation (Costs 3 Actions). Umbracyst exhales a surge of draining shadow in a 90-foot cone. Each creature in the area must make a Constitution saving throw, taking 72 necrotic damage on a failed save, or half as much on a success, and is blinded until the end of its next turn.
Cantrips
Innate SpellcastingAbjuration, Illusion, Divination— At will: darkness, detect magic, minor illusion
Innate SpellcastingNecromancy, Illusion, Evocation— 3/day each: blight, fear, wall of force
Innate SpellcastingAbjuration, Enchantment, Conjuration— 1/day each: antimagic field, power word stun, plane shift
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