course containing

Reduced-threat Aboleth

Monsters Tales from the Yawning Portal

different one. Regional Effects The region containing an aboleth’s lair is warped by the creature’s presence, which creates one or more of the following effects: Underground surfaces within

disappears. If the aboleth dies, the first two effects fade over the course of 3d10;{"diceNotation":"3d10","rollType":"roll"} days.

Veiled Presence

Monsters The Book of Many Things

action. Regional Effects The region containing a villain’s lair is warped by their presence, creating one or more of the following effects: Corruption Abounds. While within 3 miles of the

members of the villain’s organization deal poison damage while within 3 miles of the lair, they ignore the target’s resistance to poison damage. If the villain dies, these effects fade over the course of 1d10;{"diceNotation":"1d10", "rollType":"roll", "rollAction":"Days"} days.Necrotic, Radiant

Adult Lunar Dragon

Monsters Spelljammer: Adventures in Space

and heat vents, wild gardens, crystal formations, magical phenomena, or an ecosystem of lesser life forms that have adapted to living with the dragon. Regional Effects The region containing an

of bludgeoning damage. If the dragon dies, the moaning stops, the moon devils dissipate, and the black frost disappears over the course of 1d10;{"diceNotation":"1d10","rollType":"roll","rollAction

Ancient Lunar Dragon

Monsters Spelljammer: Adventures in Space

containing an ancient or adult lunar dragon’s lair is warped by the dragon’s magic, which produces one or more of the following effects: Black Frost. A thin layer of black frost

cold damage instead of bludgeoning damage. If the dragon dies, the moaning stops, the moon devils dissipate, and the black frost disappears over the course of 1d10;{"diceNotation":"1d10","rollType

Ambitious Assassin

Monsters The Book of Many Things

)","rollDamageType":"poison"}, chosen by the villain when the villain uses this action. Regional Effects The region containing a villain’s lair is warped by their presence, creating one or more of the

to poison damage. If the villain dies, these effects fade over the course of 1d10;{"diceNotation":"1d10", "rollType":"roll", "rollAction":"Days"} days.

Lorthuun

Monsters Out of the Abyss

disappears. The beholder can't repeat an effect until they have all been used, and it can't use the same effect two rounds in a row. Regional Effects A region containing a beholder's lair is warped by

before, harmless slime might coat a statue, and so on. These effects apply only to natural surfaces and to nonmagical objects that aren't on anyone's person. If the beholder dies, these effects fade over the course of 1d10;{"diceNotation":"1d10","rollType":"roll"} days.

Enchanting Infiltrator

Monsters The Book of Many Things

)","rollDamageType":"poison"}, chosen by the villain when the villain uses this action. Regional Effects The region containing a villain’s lair is warped by their presence, creating one or more

resistance to poison damage. If the villain dies, these effects fade over the course of 1d10;{"diceNotation":"1d10", "rollType":"roll", "rollAction":"Days"} days.

Demogorgon

Monsters Mordenkainen Presents: Monsters of the Multiverse

hitting him with an attack), there is a 50 percent chance that the illusory duplicate is affected, not Demogorgon, in which case the illusion disappears. Regional Effects The region containing Demogorgon

;poisonous snakes and other venomous Beasts. If Demogorgon dies, these effects fade over the course of 1d10;{"diceNotation":"1d10", "rollType":"roll", "rollAction":"Days"} days. Cultists of Demogorgon

Riverine

Monsters Journeys through the Radiant Citadel

Fury","rollDamageType":"cold"} cold damage. Regional Effects The region containing a riverine’s lair flourishes under the magic of the riverine’s presence, which creates one or more of

, the flora and fauna return to normal levels, and its river dries out over the course of 1d10;{"diceNotation":"1d10","rollType":"roll","rollAction":"Regional Effect Fade Days"} days. All other effects

Otherworldly Corrupter

Monsters The Book of Many Things

poison;{"diceNotation":"6d6","rollType":"damage","rollAction":"Traps (Poison)","rollDamageType":"poison"}, chosen by the villain when the villain uses this action. Regional Effects The region containing

damage while within 3 miles of the lair, they ignore the target’s resistance to poison damage. If the villain dies, these effects fade over the course of 1d10;{"diceNotation":"1d10", "rollType

Zuggtmoy Legacy

Monsters Out of the Abyss

lair, instead of on herself. Regional Effects The region containing Zuggtmoy’s lair is warped by her magic, creating one or more of the following effects: Molds and fungi grow on surfaces

that succeeds on this saving throw can’t be affected by this regional effect again for 24 hours. If Zuggtmoy dies, these effects fade over the course of 1d10;{"diceNotation":"1d10","rollType

Fraz-Urb'luu

Monsters Mordenkainen Presents: Monsters of the Multiverse

Effects The region containing Fraz-Urb’luu’s lair is warped by his magic, creating one or more of the following effects: Beguiling Realm. Within 6 miles of the lair, all Charisma (Persuasion

navigation in the area exceedingly difficult. If Fraz-Urb’luu dies, these effects fade over the course of 1d10;{"diceNotation":"1d10","rollType":"roll"} days. Cultists of Fraz-Urb’luu Fraz

Demogorgon Legacy

Monsters Out of the Abyss

doesn’t need to concentrate on the spells, which end on initiative count 20 of the next round. Regional Effects The region containing Demogorgon’s lair is warped by his magic

, these effects fade over the course of 1d10;{"diceNotation":"1d10","rollType":"roll"} days. Madness of Demogorgon If a creature goes mad in Demogorgon’s lair or within line of sight of the

Fraz-Urb'luu Legacy

Monsters Out of the Abyss

take 33 (6d10) psychic damage. Regional Effects The region containing Fraz-Urb’luu’s lair is warped by his magic, creating one or more of the following effects: Intelligent

’luu dies, these effects fade over the course of 1d10;{"diceNotation":"1d10","rollType":"roll"} days. Madness of Fraz-Urb’luu If a creature goes mad in Fraz-Urb’luu’s lair or

Graz'zt Legacy

Monsters Out of the Abyss

(Stealth) checks made to hide. Regional Effects The region containing Graz’zt’s lair is warped by his magic, creating one or more of the following effects: Flat surfaces within 1 mile of

hours. If Graz’zt dies, these effects fade over the course of 1d10;{"diceNotation":"1d10","rollType":"roll"} days. Madness of Graz’zt If a creature goes mad in Graz’zt’s

Geryon

Monsters Mordenkainen Presents: Monsters of the Multiverse

The region containing Geryon’s lair is warped by his magic, creating one or more of the following effects: Chilling Wind. Freezing strong winds howl around the area within 1 mile of the lair

traveler somewhere in Stygia. If Geryon dies, these effects fade over the course of 1d10;{"diceNotation":"1d10","rollType":"roll"} days. Cultists of Geryon Geryon grants his cultists special

Baphomet Legacy

Monsters Out of the Abyss

that is no longer in any dimension than 100 feet. The effect ends on the next initiative count 20. Regional Effects The region containing Baphomet’s lair is warped by his magic, creating one or

be affected by this regional effect again for 24 hours. If Baphomet dies, these effects fade over the course of 1d10;{"diceNotation":"1d10","rollType":"roll"} days. Madness of Baphomet If a

Orcus Legacy

Monsters Out of the Abyss

disappear or until Orcus releases their grasp (no action required). Regional Effects The region containing Orcus’s lair is warped by the Orcus’s magic, creating one or more of the following

again for 24 hours. If Orcus dies, these effects fade over the course of 1d10;{"diceNotation":"1d10","rollType":"roll"} days. Madness of Orcus If a creature goes mad in Orcus’s lair or

Juiblex

Monsters Mordenkainen Presents: Monsters of the Multiverse

);{"diceNotation":"4d10","rollType":"damage","rollAction":"Sticky Slime","rollDamageType":"fire"} fire damage. Regional Effects The region containing Juiblex’s lair is warped by its magic

, which is slick and sticks to anything that touches it. If Juiblex dies, these effects fade over the course of 1d10;{"diceNotation":"1d10","rollType":"roll"} days. Cultists of Juiblex The Faceless

Orcus

Monsters Mordenkainen Presents: Monsters of the Multiverse

Monster Manual). These Undead obey his telepathic commands, which can reach anywhere in the lair. Regional Effects The region containing Orcus’s lair is warped by his magic, creating one or more

Undead mockeries of their former selves. Skeletal and zombie versions of local wildlife are commonly seen in the area. If Orcus dies, these effects fade over the course of 1d10;{"diceNotation":"1d10

Zariel

Monsters Mordenkainen Presents: Monsters of the Multiverse

of its turns, ending the effect on itself on a success. Regional Effects The region containing Zariel’s lair is warped by her magic, which creates one or more of the following effects

cleared away. If Zariel dies, these effects fade over the course of 1d10;{"diceNotation":"1d10", "rollType":"roll", "rollAction":"Days"} days. Cultists of Zariel Zariel grants special abilities to

Zuggtmoy

Monsters Mordenkainen Presents: Monsters of the Multiverse

herself. Regional Effects The region containing Zuggtmoy’s lair is warped by her magic, creating one or more of the following effects: Corrupted Nature. Within 6 miles of the lair, all Wisdom

Vegetation. Vegetation within 1 mile of the lair becomes infested with parasitic fungi, slowly mutating as it is overwhelmed. If Zuggtmoy dies, these effects fade over the course of 1d10

Yeenoghu Legacy

Monsters Out of the Abyss

, causing them to have advantage on melee weapon attack rolls and causing attack rolls to have advantage against them. Regional Effects The region containing Yeenoghu’s lair is warped by his

creature that succeeds on this saving throw can’t be affected by this regional effect again for 24 hours. If Yeenoghu dies, these effects fade over the course of 1d10;{"diceNotation":"1d10

Baphomet

Monsters Mordenkainen Presents: Monsters of the Multiverse

for 1 minute or until Baphomet takes this lair action again. Regional Effects The region containing Baphomet’s lair is warped by his magic, creating one or more of the following effects

frightened and disoriented, as though constantly under threat of being hunted, and might lash out or panic even when no visible threat is nearby. If Baphomet dies, these effects fade over the course of

Geryon (Variant)

Monsters Mordenkainen Presents: Monsters of the Multiverse

Effects The region containing Geryon’s lair is warped by his magic, creating one or more of the following effects: Chilling Wind. Freezing strong winds howl around the area within 1 mile of

deposits a traveler somewhere in Stygia. If Geryon dies, these effects fade over the course of 1d10;{"diceNotation":"1d10","rollType":"roll"} days. Cultists of Geryon Geryon grants his cultists special

Graz'zt

Monsters Mordenkainen Presents: Monsters of the Multiverse

have disadvantage on Dexterity (Stealth) checks made to hide. Regional Effects The region containing Graz’zt’s lair is warped by his magic, creating one or more of the following effects

are made of stone or metal become highly reflective, as though polished to a shine. These surfaces become supernaturally mirrorlike. If Graz’zt dies, these effects fade over the course of 1d10

Yeenoghu

Monsters Mordenkainen Presents: Monsters of the Multiverse

or hyena that Yeenoghu can see can use its reaction to move up to its speed. Regional Effects The region containing Yeenoghu’s lair is warped by his magic, creating one or more of the

Yeenoghu dies, these effects fade over the course of 1d10;{"diceNotation":"1d10", "rollType":"roll", "rollAction":"Days"} days. Cultists of Yeenoghu Yeenoghu grants special abilities to his cultists. His

Zargon the Returner

Monsters Quests from the Infinite Staircase

again. Regional Effects The region containing Zargon’s lair is warped by Zargon’s unnatural presence, creating one or more of the following effects: Arcane Enervation. Enemies of Zargon

patterns that defy the region’s typical climate. If Zargon dies, these effects fade over the course of 1d10;{"diceNotation":"1d10", "rollType":"roll", "rollAction":"Regional Effect Fade Time"} days.Acid, PoisonCold, Fire; Bludgeoning, Piercing, and Slashing from Nonmagical Attacks

Klauth

Monsters Storm King's Thunder

must succeed on a DC 13 Constitution saving throw or be poisoned until the end of its turn. While poisoned in this way, a creature is incapacitated. Regional Effects The region containing a

of elemental fire into the world to dwell nearby. If the dragon dies, these effects fade over the course of 1d10;{"diceNotation":"1d10","rollType":"roll"} days.FireCold

Hierophant Medusa

Monsters The Book of Many Things

a surface such as a ceiling with no way to remain there (for example, sufficient handholds), it falls at the end of this movement. Regional Effects The region containing a medusa’s lair is

relevant to the medusa’s divine purpose. If the medusa dies, these effects fade over the course of 1d10;{"diceNotation":"1d10", "rollType":"roll", "rollAction":"Days"} days.PoisonPetrifying Gaze

Juiblex Legacy

Monsters Out of the Abyss

Guide) appears on a spot on the ceiling that Juiblex chooses within the lair. The slime disintegrates after 1 hour. Regional Effects The region containing Juiblex’s lair is warped by its

regional effect again for 24 hours. If Juiblex dies, these effects fade over the course of 1d10;{"diceNotation":"1d10","rollType":"roll"} days. Madness of Juiblex If a creature goes mad in Juiblex

Belashyrra

Monsters Eberron: Rising from the Last War

’s lair is known to touch remote areas of the Shadow Marches and caverns below Xen’drik. A region containing a passage to Belashyrra’s lair is warped by its magic, which creates one or

effects fade over the course of 1d10;{"diceNotation":"1d10","rollType":"roll"} days. Madness of Belashyrra If a creature goes mad in Belashyrra’s lair or while it can see the daelkyr, it gains

Ancient Dragon Turtle

Monsters Fizban's Treasury of Dragons

"} fire damage on a failed save, or half as much damage on a successful one. Being underwater doesn’t grant creatures resistance to this damage. Regional Effects The region containing a dragon

water within 6 miles of the dragon turtle’s lair to 100 degrees Fahrenheit. If the dragon turtle dies, these effects fade over the course of 1d10;{"diceNotation":"1d10","rollType":"roll

Adult Red Dragon Legacy

Monsters Basic Rules (2014)

incapacitated. Regional Effects The region containing a legendary red dragon’s lair is warped by the dragon’s magic, which creates one or more of the following effects: Small

lair form portals to the Elemental Plane of Fire, allowing creatures of elemental fire into the world to dwell nearby. If the dragon dies, these effects fade over the course of 1d10;{"diceNotation":"1d10","rollAction":"Days","rollType":"roll"} days.Fire

Adult Copper Dragon Legacy

Monsters Basic Rules (2014)

the next round, the mud hardens, and the Strength DC to work free increases to 20. Regional Effects The region containing a legendary copper dragon’s lair is warped by the dragon’s magic

amusing. If the dragon dies, the magic carvings fade over the course of 1d10;{"diceNotation":"1d10","rollType":"roll"} days. The other effects end immediately.Acid

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