Gargantuan Monstrosity, Chaotic Evil
Armor Class 19 Natural armor
Hit Points 160 (10d12 + 8)
Speed 10 ft.
STR
17 (+3)
DEX
24 (+7)
CON
20 (+5)
INT
20 (+5)
WIS
15 (+2)
CHA
23 (+6)
Damage Resistances Bludgeoning, Piercing, and Slashing from Nonmagical Attacks, Damage Dealt By Traps
Condition Immunities Charmed, Invisible, Paralyzed
Senses Blindsight 200 ft, Passive Perception 15
Languages Abyssal, Common, Deep Speech Abyssal, Infernal, Common.
Challenge 15 (13,000 XP)
Proficiency Bonus +5
Traits

Multiattack. The Ancient beast gets 2 attacks if it takes the attack action on its turn.

Nightmare transformation. If the Ancient Beast dies, it transforms into the Horror Beast. This can only be stopped by a wish spell.

Actions

Stomp. Melee weapon attack: +9 to hit, reach 30 ft, 1 target. Hit: (9d10 + 5) Bludgeoning damage.

Dark crystal. Ranged weapon attack: +6 to hit, reach 100 ft. 1 target. Hit: (7d10 + 3 Necrotic damage.

Call servants. Summons 2 Undead Monkey Soldiers to any two points the ancient beast can see within 200 feet of it.

Promote. The ancient beast can choose two Undead Monkey Soldiers he can see. They transform into Undead Monkey Berserkers.

Spellcasting. The ancient beast can cast Weird twice a day.

Description

The ancient king of darkness, he will bring calamity to the world. Heading an army of undead primates, he is unbelievably powerful, and he hasn't even shown his true form. 

Lair and Lair Actions

The Ancient beast's Lair is a massive castle on a floating island. It has corridors and twists and winds, confusing Intruders. It is protected by Undead Monkey Soldiers.

Lair Actions

On initiative count 4 (losing initiative ties), the Ancient beast takes a lair action to cause one of the following effects; the Ancient beast can’t use the same effect two rounds in a row:

  • Create a fireball Explosion anywhere in its lair.
  • Create 3 Undead Monkey Soldiers anywhere in its lair.

Regional Effects

The region containing a legendary [monster name]’s lair is [enter the effect description], which creates one or more of the following effects:

  • Dark clouds appear everywhere around the lair for 2 miles starting at 6:00 PM and ending at 5:00 AM.
  • The dead randomly rise every night.

If the Ancient beast dies, these effects fade instantly.

Monster Tags: monstrosity

Habitat: Mountain

Yeetlord300

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