Beholder Behemoth

gargantuan aberration (beholder), lawful evil

Challenge 15.0 (13,000 XP)

Available with DM subscription
STR
14 (+2)
DEX
19 (+4)
CON
20 (+5)
INT
25 (+7)
WIS
15 (+2)
CHA
20 (+5)

Defense

Armor Class
20 (Natural Armor)
Hit Points
300 (20d20 + 100 +5)
Speed
fly 50 ft., (hover)

Proficiencies & Senses

Saving Throws intelligence, wisdom
Skills
Arcana +12, History +12, Deception +10, Perception +15, Intimidation +12
Senses
darkvision 120 ft.
blindsight 60 ft.
truesight 120 ft.
Mage Sight 60 ft. (Can perceive magical auras and energies.)
passive Perception 25

Characteristics

Damage Vulnerabilities
radiant
Damage Resistances
necrotic, psychic
Damage Immunities
blinded, charmed, deafened, frightened, paralyzed, petrified
Condition Immunities
prone
Languages Deep Speech, Telepathy 120 ft.

Traits

Legendary Resistance (3/Day)

If the Beholder Behemoth fails a saving throw, it can choose to succeed instead.

Antimagic Cone

The Beholder Behemoth's central eye creates an area that suppresses magic. Any spells cast in the cone within a 150 ft. radius must succeed on a DC 18 saving throw to take effect.

Eye Rays

The Beholder Behemoth can fire up to three eye rays in one turn, each targeting a different creature within 120 ft. Each ray has a different effect.

Actions

Multiattack

The Beholder Behemoth can use its Antimagic Cone and make three eye ray attacks.

Fear Ray

Target must succeed on a DC 18 Wisdom saving throw or be frightened for 1 minute. A frightened target can repeat the saving throw at the end of each of its turns.

Charm Ray

Target must succeed on a DC 18 Wisdom saving throw or be charmed by the Beholder Behemoth for 1 hour, or until it takes damage.

Sleep Ray

Target must succeed on a DC 18 Wisdom saving throw or fall asleep for 1 minute.

Combat Behavior

Tactics


• Utilizes its Antimagic Cone to disable spellcasters before confronting foes directly.
• Strategically positions itself above the battlefield to maximize the range of its eye rays.
• Employs psychological tactics, spreading fear and chaos among enemy ranks.

Combat Style

Ranged bombardment through eye rays, using psychological tactics to dominate the battlefield.

Morale

The Beholder Behemoth fights to the death if its lair is threatened; otherwise, it prefers tactical retreats to preserve its existence.

Monster Description

The Beholder Behemoth is a colossal aberration, feared across the realms for its terrifying power and tyrannical control. Towering over average beings, its body is a grotesque mass of eyestalks and a decaying central eye. Each eyestalk resembles a gnarled root, pulsating with dark energy, while its central eye glows with a deep crimson hue, often blinding lesser creatures that gaze upon it. Its hide has a texture reminiscent of cracked obsidian, reflecting light in menacing patterns as it moves, hovering gracefully despite its size. Known for its cunning and manipulative nature, the Beholder Behemoth uses its intellect as much as its formidable magical attacks. It claims dominion over the darker recesses of the world, often using cult-like followers to do its bidding and expand its influence. Those who dare intrude upon its lair rarely return, as the Beholder Behemoth’s eye rays can strip a hero of their resolve faster than they can draw their weapons.

Monster behavior

In battle, the Beholder Behemoth is an intelligent tactician. It prefers to operate from a distance, using its eye rays to inflict debilitating effects on its enemies. With the ability to create an anti-magic area, it neutralizes spellcasters before they can employ their formidable powers. The Beholder Behemoth often uses psychological warfare, charming or instilling fear in its foes, causing them to question their own capabilities. It thrives on causing chaos and often positions itself to strike against the weaker, less organized foes first. When needed, it will delegate to its followers, using them as pawns to test its enemies first. Should its health be severely compromised, it will retreat to a hidden lair, seeking to recuperate while laying traps for the unsuspecting adventurers. The Beholder Behemoth embodies a true predator, reveling in both the hunt and the fight.

Ecology

As a dominant predator in its environment, the Beholder Behemoth plays a critical role in controlling the populations of various creatures in the caverns and ruins it inhabits. The remnants of its victims often serve to feed the ecosystem of the Underdark, encouraging the growth of parasitic fungi and other aberrant flora. This twisted connection to its surroundings allows a unique parasitic symbiosis with the land, fostering life where none should exist. Other creatures are compelled to either avoid or worship it, offering sacrifices in hopes of avoiding the monster's wrath. Its presence is a constant factor in the region's power dynamics, often leading other monsters and parties to form uneasy alliances or fierce rivalries.

History

The history of the Beholder Behemoth is intertwined with myths of power and darkness. It is said that it was once a powerful wizard who sought forbidden knowledge to surpass the limitations of mortal beings. In its ambition, it managed to merge its essence with that of a beholder, resulting in a twisted form of existence that defied the natural order. This transformation granted it immense power but at the cost of its former identity. Throughout the centuries, the Beholder Behemoth has been both feared and revered, often inspiring legends of its terroring might. Its sightings have caused legends to spring forth in many cultures, with some believing it to be a god, others seeing it as the ultimate evil. Its lairs, hidden by illusions and dark magic, serve as mythic locales filled with riddles, traps, and powerful artifacts. Over time, it has manipulated various factions both above and below ground, ensuring its survival against those who would seek to end its reign. With every passing decade, the Beholder Behemoth's domain only seems to grow, consumed by a hunger that knows no bounds.

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