Large Ooze, Unaligned
Armor Class 15 (natural armor)
Hit Points 136 (16d10 + 48)
Speed 25 ft., Swim 50 ft.
STR
18 (+4)
DEX
8 (-1)
CON
16 (+3)
INT
5 (-3)
WIS
10 (+0)
CHA
5 (-3)
Skills Stealth +2
Damage Vulnerabilities Radiant
Damage Resistances Cold, Fire
Damage Immunities Lightning, Necrotic
Condition Immunities Blinded, Deafened, Exhaustion
Senses Blindsight 60 ft. (blind beyond this radius), Passive Perception 10
Languages --
Challenge 5 (1,800 XP)
Proficiency Bonus +3
Traits

Lightning Absorption. Whenever the shambling mound is subjected to lightning damage, it takes no damage and regains a number of hit points equal to the lightning damage dealt.

Necrotic Absorption. Whenever the undead shambling mound is subjected to necrotic damage, it takes no damage and regains a number of hit points equal to the necrotic damage dealt.

Actions

Multi-attack. Two slam attacks. If both attacks hit a Medium or smaller target, the target is grappled (escape DC 14), and the Ancient Essence uses its Engulf on it.

Slam. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) bludgeoning damage.

Tentacle. Melee Weapon Attack: +8 to hit, reach 15 ft., one target. Hit: 10 (1d10 + 5) bludgeoning damage. If the target is Large or smaller, it is grappled (escape DC 16) and restrained until the grapple ends. The Ancient Essence can create two tentacles, each of which can grapple one target.

Engulf. The Ancient Essence engulfs a Medium or smaller creature grappled by it. The engulfed target is blinded, restrained, and unable to breathe, and it must succeed on a DC 14 Constitution saving throw at the start of each of the Essence's turns or take 13 (2d8 + 4) bludgeoning damage. If the mound moves, the engulfed target moves with it. The creature can have only one creature engulfed at a time.

Gaze. Essence creates a magical eye on his form, and turns its magical gaze toward one creature that he can see within 120 feet of him. That target must make a DC 20 Wisdom saving throw. Unless the target is incapacitated, it can avert its eyes to avoid the gaze and to automatically succeed on the save. If the target does so, it can’t see Essence until the start of his next turn. If the target looks at him in the meantime, it must immediately make the save.

Insanity Gaze. The target suffers the effect of the confusion spell without making a saving throw. The effect lasts until the start of the Ancient Essence next turn, and is not a concentration spell.

Legendary Actions

Legendary Resistance (1/Day). If you fail a saving throw, you can choose to succeed instead.

Description

Housed inside a combination of Celestial & Demonic gemstone. Although being raw energy, once the gemstone is broken, its dark properties manifests a dark black ooze monstrosity. It only acts, attacking all within sight. Its loyalty is to itself, and his prime directive is to its creator. 

The body created can be destroyed, but like a Lich, it will return after resting long enough to regain its abilities.

Habitat: CoastalForestGrasslandHillMountainSwampUnderdarkUnderwaterUrban

Auron_The_Dark

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