cause with rounds

Scion of Stronmaus

Monsters Bigby Presents: Glory of the Giants

cloud up to 30 feet and cause one of the following effects in a 30-foot-radius, 120-foot-high cylinder directly below it; the scion can’t choose the same effect two rounds in a row: Acid Rain

’s not particularly interested in Humanoids or other little creatures—either in conversing with them or in protecting them from harm it might cause. If the scion is threatened, it unleashes

Fraz-Urb'luu Legacy

Monsters Out of the Abyss

of their holy cause, only to eventually reveal his true nature and claim their souls as his own.Fraz-Urb’luu’s Lair Fraz-Urb’luu’s lair lies within the Abyssal lair known as

(62,000 XP) when he’s encountered in his lair. Lair Actions On initiative count 20 (losing initiative ties), Fraz-Urb’luu can take a lair action to cause one of the following effects; he can

Yeenoghu Legacy

Monsters Out of the Abyss

flail attacks. If an attack hits, he can cause it to create an additional effect of his choice or at random (each effect can be used only once per Multiattack): 1. The attack deals an extra 13 (2d12

of civilization on his layer of the Abyss. Lair Actions On initiative count 20 (losing initiative ties), Yeenoghu can take a lair action to cause one of the following effects; he can’t use the

Imix

Monsters Princes of the Apocalypse

(such as the Weeping Colossus in chapter 5). On initiative count 20 (losing initiative ties), Imix uses his lair action to cause one of the following effects: Any fires in the lair flare up

":"Wildfire","rollDamageType":"fire"} fire damage. A wildfire continues to threaten the characters for 1d10;{"diceNotation":"1d10","rollType":"roll","rollAction":"Wildfire Rounds"} rounds or until they

Arcturia

Monsters Waterdeep: Dungeon of the Mad Mage

initiative ties), the lich can take a lair action to cause one of the following magical effects; the lich can’t use the same effect two rounds in a row: The lich rolls a d8 and regains a spell

Diderius

Monsters Tyranny of Dragons

encountered in its lair has a challenge rating of 16 (15,000 XP). Lair Actions On initiative count 20 (losing initiative ties), the mummy lord takes a lair action to cause one of the following effects

; the mummy lord can’t use the same effect two rounds in a row. Each undead creature in the lair can pinpoint the location of each living creature within 120 feet of it until initiative count 20

Valindra Shadowmantle

Monsters Tomb of Annihilation

the lich’s work. A lich encountered in its lair has a challenge rating of 22 (41,000 XP). Lair Actions On initiative count 20 (losing initiative ties), the lich can take a lair action to cause

one of the following magical effects; the lich can’t use the same effect two rounds in a row: The lich rolls a d8 and regains a spell slot of that level or lower. If it has no spent spell

Zikzokrishka

Monsters Candlekeep Mysteries

, Zikzokrishka can take a lair action to cause one of the following effects. She can’t use the same effect two rounds in a row: Part of the ceiling collapses above one creature that Zikzokrishka

Nintra Siotta

Monsters Candlekeep Mysteries

schemes of others? No one is my equal in cunning.”On initiative count 20 (losing initiative ties) Nintra can take a lair action to cause one of the following effects; she can’t use the same

effect two rounds in a row: Nintra targets one pane of shadow glass in her lair, causing it to explode into shards. Each creature within 20 feet of the exploding pane must make a DC 18 Dexterity

Lorthuun

Monsters Out of the Abyss

ties), the beholder can take one lair action to cause one of the following effects: A 50-foot square area of ground within 120 feet of the beholder becomes slimy; that area is difficult terrain until

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

Exethanter

Monsters Curse of Strahd

its lair has a challenge rating of 22 (41,000 XP). Lair Actions On initiative count 20 (losing initiative ties), Exethanter can take a lair action to cause one of the following magical effects

; Exethanter can’t use the same effect two rounds in a row: Exethanter rolls a d8;{"diceNotation":"1d8","rollType":"roll","rollAction":"Spell Slot Level"} and regains a spell slot of that level or

Mighty Servant of Leuk-o

Magic Items Tasha’s Cauldron of Everything

soul of the mighty warlord Leuk-o was drawn into the artifact and has become its animating force. The servant has been known to attack or move of its own accord, particularly if doing so will cause

, the servant’s two crew members can cause it to explode. The self-destruct code is not revealed to crew members when they attune to the artifact. If the code is discovered (the DM determines how

Demogorgon Legacy

Monsters Out of the Abyss

bulk of this palace extends deep underwater, in chill and darkened caverns. Lair Actions On initiative count 20 (losing initiative ties), Demogorgon can take a lair action to cause one of the

following effects; Demogorgon can’t use the same effect two rounds in a row: Demogorgon creates an illusory duplicate of himself, which appears in his own space and lasts until initiative count 20

Graz'zt Legacy

Monsters Out of the Abyss

initiative count 20 (losing initiative ties), Graz’zt can take a lair action to cause one of the following effects; he can’t use the same effect two rounds in a row: Graz’zt casts

Ogrémoch

Monsters Princes of the Apocalypse

count 20 (losing initiative ties), Ogrémoch uses his lair action to cause one of the following effects: A 10-foot-radius area of rocky or earthy ground within 60 feet of Ogrémoch turns

tremors"} rounds. At first, damage is minor — broken windows, cracked plaster, items toppled off shelves. The longer Ogrémoch remains, the stronger the tremors become. After 5 days, the

Yeenoghu

Monsters Mordenkainen Presents: Monsters of the Multiverse

+ 9);{"diceNotation":"2d12+9", "rollType":"damage", "rollAction":"Flail", "rollDamageType":"force"} force damage. If it’s his turn, Yeenoghu can cause the target to suffer one of the following

initiative count 20 (losing initiative ties), Yeenoghu can take one of the following lair actions; he can’t take the same lair action two rounds in a row: Incite the Pack. Until the next initiative

Baphomet Legacy

Monsters Out of the Abyss

, populated by minotaur;minotaurs, goristro;goristros, and quasit;quasits. Lair Actions On initiative count 20 (losing initiative ties), Baphomet can take a lair action to cause one of the following

magical effects; he can’t use the same effect two rounds in a row: Baphomet seals one doorway or other entryway within the lair. The opening must be unoccupied. It is filled with solid stone for

Orcus Legacy

Monsters Out of the Abyss

action to cause one of the following effects; he can’t use the same effect two rounds in a row: Orcus’s voice booms throughout the lair. His utterance causes one creature of his choice to

Yan-C-Bin

Monsters Princes of the Apocalypse

Caves, described in chapter 5), Yan-C-Bin is master. He can use the following actions in his lair. Lair Actions On initiative count 20 (losing initiative ties), Yan-C-Bin takes a lair action to cause

one of the following effects; he can’t use the same effect two rounds in a row: Yan-C-Bin drops the temperature of the air, covering all surfaces with ice. This effect is identical to the

Nurvureem

Monsters Princes of the Apocalypse

snakes infest the lair, which is filled with the stench of death and decay. Lair Actions On initiative count 20 (losing initiative ties), the dragon takes a lair action to cause one of the

following effects; the dragon can’t use the same effect two rounds in a row: Pools of water that the dragon can see within 120 feet of it surge outward in a grasping tide. Any creature on the ground

Valin Sarnaster

Monsters Candlekeep Mysteries

Sarnaster’s Lair Valin can use her lair actions in any area of the tomb. Lair Actions On initiative count 20 (losing initiative ties), Valin takes a lair action to cause one of the following

effects; Valin can’t use the same effect two rounds in a row. Each undead creature in the lair can pinpoint the location of each living creature within 120 feet of it until initiative count 20

Iymrith

Monsters Storm King's Thunder

intruders. Lair Actions On initiative count 20 (losing initiative ties), the dragon takes a lair action to cause one of the following effects; the dragon can’t use the same effect two rounds in a

Zuggtmoy Legacy

Monsters Out of the Abyss

), Zuggtmoy can take a lair action to cause one of the following effects; she can’t use the same effect two rounds in a row. Zuggtmoy causes four gas spore;gas spores or violet fungus;violet fungi

Gorka Tharn

Monsters Waterdeep: Dungeon of the Mad Mage

takes a lair action to cause one of the following effects; the mummy lord can’t use the same effect two rounds in a row. Each undead creature in the lair can pinpoint the location of each

Dyrrn

Monsters Eberron: Rising from the Last War

within the Palace of Sinew, Dyrrn can invoke the ambient magic to take lair actions. On initiative count 20 (losing initiative ties), Dyrrn can take a lair action to cause one of the following effects; it

can’t use the same effect two rounds in a row: Dyrrn uses its Corruption action. A 30-foot-square area of ground within 120 feet of Dyrrn sprouts tentacles until initiative count 20 on the

Fraz-Urb'luu

Monsters Mordenkainen Presents: Monsters of the Multiverse

to greater and greater atrocities in the name of their cause, only to eventually reveal his true nature and claim their souls as his own.Fraz-Urb’luu’s Lair Fraz-Urb’luu’s

’t use the same effect two rounds in a row: Conjure Walls and Doors. Fraz-Urb’luu causes up to five doors within the lair to become walls and an equal number of doors to appear on walls where

Baernaloth

Monsters Planescape: Adventures in the Multiverse

wounded foes alive, sometimes indefinitely, to prolong their suffering. Even striking against a baernaloth brings misery—they can cause an attacker’s old wounds to painfully reopen. All the

baernaloth can take one of the following lair actions; the baernaloth can’t take the same lair action two rounds in a row: Consume Suffering. Until initiative count 20 on the next round, when a creature

Klauth

Monsters Storm King's Thunder

lair action to cause one of the following effects; the dragon can’t use the same effect two rounds in a row: Magma erupts from a point on the ground the dragon can see within 120 feet of it

Unspeakable Horror (Aberrant Armor)

Monsters Van Richten’s Guide to Ravenloft

horror’s appearance are drawn from the fears of those within 100 feet of it. This might cause a mist horror to take on a form that combines multiple fears when it encounters a group, like a wolf

":"Mist Horror"} rounds outside the Mists, they lose cohesion and collapse back into harmless vapor. Body Composition d4;{"diceNotation":"1d4","rollType":"roll","rollAction":"Body Composition

Juiblex Legacy

Monsters Out of the Abyss

initiative ties), Juiblex can take a lair action to cause one of the following effects; it can’t use the same effect two rounds in a row: Juiblex slimes a square area of ground it can see within the

Claugiyliamatar (possessed)

Monsters Divine Contention

(losing initiative ties), the dragon takes a lair action to cause one of the following effects; the dragon can’t use the same effect two rounds in a row: Grasping roots and vines erupt in a 20

Hythonia

Monsters Mythic Odysseys of Theros

. Lair Actions On initiative count 20 (losing initiative ties), Hythonia can take a lair action to cause one of the following effects. She can’t use the same effect two rounds in a row

Belashyrra

Monsters Eberron: Rising from the Last War

initiative ties), Belashyrra can take a lair action to cause one of the following effects; it can’t use the same effect two rounds in a row: An eye opens on a solid surface within 60 feet of

Claugiyliamatar

Monsters Storm King's Thunder

their lairs with vegetation. Lair Actions On initiative count 20 (losing initiative ties), the dragon takes a lair action to cause one of the following effects; the dragon can’t use the same

effect two rounds in a row: Grasping roots and vines erupt in a 20-foot radius centered on a point on the ground that the dragon can see within 120 feet of it. That area becomes difficult terrain, and

Unspeakable Horror (Loathsome Limbs)

Monsters Van Richten’s Guide to Ravenloft

them appear to be composed of living mist. Further details of a mist horror’s appearance are drawn from the fears of those within 100 feet of it. This might cause a mist horror to take on a form

Mists: after 1d4;{"diceNotation":"1d4","rollType":"roll","rollAction":"Mist Horror"} rounds outside the Mists, they lose cohesion and collapse back into harmless vapor. Body Composition d4

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