before both decide ceiling rounds

Ancient Blue Dragon Legacy

Monsters Basic Rules (2014)

same effect two rounds in a row: Part of the ceiling collapses above one creature that the dragon can see within 120 feet of it. The creature must succeed on a DC 15 Dexterity saving throw or take 10

(3d6);{"diceNotation":"3d6","rollType":"damage","rollAction":"Ceiling Collapse","rollDamageType":"bludgeoning"} bludgeoning damage and be knocked prone and buried. The buried target is restrained and

Adult Blue Dragon Legacy

Monsters Basic Rules (2014)

effect two rounds in a row: Part of the ceiling collapses above one creature that the dragon can see within 120 feet of it. The creature must succeed on a DC 15 Dexterity saving throw or take 10

(3d6);{"diceNotation":"3d6","rollType":"damage","rollAction":"Ceiling Collapse","rollDamageType":"bludgeoning"} bludgeoning damage and be knocked prone and buried. The buried target is restrained and

Adult White Dragon Legacy

Monsters Basic Rules (2014)

the ceiling to latch on like bats or slithering down icy crevasses. A legendary white dragon’s innate magic deepens the cold in the area around its lair. Mountain caverns are fast frozen by the

breath. 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

Ancient White Dragon Legacy

Monsters Basic Rules (2014)

the ceiling to latch on like bats or slithering down icy crevasses. A legendary white dragon’s innate magic deepens the cold in the area around its lair. Mountain caverns are fast frozen by the

freezing breath. 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

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

can see. The creature must succeed on a DC 15 Dexterity saving throw or take 21 (6d6);{"diceNotation":"6d6","rollType":"damage","rollAction":"Ceiling Collapse","rollDamageType":"bludgeoning

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

row: Part of the ceiling collapses above one creature that the dragon can see within 120 feet of it. The creature must succeed on a DC 15 Dexterity saving throw or take 10 (3d6);{"diceNotation":"3d6

Baphomet

Monsters Mordenkainen Presents: Monsters of the Multiverse

ties), Baphomet can take one of the following lair actions; he can’t take the same lair action two rounds in a row: Illusory Room. Baphomet casts mirage arcane, affecting a room within the lair

action to land on a ceiling to attack targets flying near it. Seal the Way. Baphomet seals one doorway or other entryway within the lair. The opening must be unoccupied. It is filled with solid stone

Baphomet Legacy

Monsters Out of the Abyss

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

gravity reversal if he’s in the room, although he likes to use this action to land on a ceiling to attack targets flying near it. Baphomet casts mirage arcane, affecting a room within the lair

Juiblex

Monsters Mordenkainen Presents: Monsters of the Multiverse

of the following lair actions; it can’t take the same lair action two rounds in a row: Green Slime. A green slime (see the Dungeon Master’s Guide) appears on a spot on the ceiling that

Adult Amethyst Dragon

Monsters Fizban's Treasury of Dragons

the air is cool and slightly damp. Glowing Crystals. Large clusters of glowing amethyst crystals grow out from the walls and ceiling, casting dim light in a 30-foot radius. Chimneys. Two chimneys

connect the main caves to the three chambers above. Each chimney appears to continue up through the ceiling of the upper level and down through the floor of the lower level, but the dragon’s

Ancient Deep Dragon Legacy

Monsters Fizban's Treasury of Dragons

or ambush visitors if the need arises. A well-cultivated lair abounds with Underdark fungi and plants, with the floor, walls, and ceiling covered in carpets of mold and moss, or featuring larger

initiative ties), the dragon can take one of the following lair actions; the dragon can’t take the same lair action two rounds in a row: Deep Torpor. The dragon casts the slow spell, requiring no

Adult Deep Dragon Legacy

Monsters Fizban's Treasury of Dragons

that allow them to escape or ambush visitors if the need arises. A well-cultivated lair abounds with Underdark fungi and plants, with the floor, walls, and ceiling covered in carpets of mold and moss

initiative count 20 (losing initiative ties), the dragon can take one of the following lair actions; the dragon can’t take the same lair action two rounds in a row: Deep Torpor. The dragon casts the

Ancient Amethyst Dragon

Monsters Fizban's Treasury of Dragons

ceiling, casting dim light in a 30-foot radius. Chimneys. Two chimneys connect the main caves to the three chambers above. Each chimney appears to continue up through the ceiling of the upper level and

Actions On initiative count 20 (losing initiative ties), the dragon can take one of the following lair actions; the dragon can’t take the same lair action two rounds in a row: Beguiling Whisper

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

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

Hierophant Medusa

Monsters The Book of Many Things

; the medusa can’t take the same lair action two rounds in a row: Petrifying Wave. Up to three creatures the medusa can see within the lair are partially turned to stone. Each target must make a

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

7. Kitchen

Compendium - Sources->Dungeons & Dragons->Tyranny of Dragons

bubbling stew pot and shanks of venison suspended above it. Strings of onions and herbs crisscross the ceiling like webs above cluttered tables. Preparing meals are four humans: two men and two women. All

they can put up a fight. If attacked, one cultist runs to the drake kennels (area 2) to fetch Trepsin and his drakes. Those reinforcements arrive 3 rounds later.

7. Kitchen

Compendium - Sources->Dungeons & Dragons->Hoard of the Dragon Queen

bubbling stew pot and shanks of venison suspended above it. Strings of onions and herbs crisscross the ceiling like webs above cluttered tables. Preparing meals are four humans: two men and two women. All

put up a fight. If attacked, one cultist runs to the drake kennels (area 2) to fetch Trepsin and his drakes. Those reinforcements arrive 3 rounds later.

24: Escape Pod

Compendium - Sources->Dungeons & Dragons->The Book of Many Things

in the ceiling to open, and a pulse of energy to propel the pod through a narrow tunnel and out of the Donjon Sphere, leaving the pod adrift in the Astral Sea. The entire sequence takes 3 rounds after the lever is pulled.

Random Traps

Compendium - Sources->Dungeons & Dragons->Dungeon Master’s Guide (2014)

, start with the Trap Effects and Trap Trigger tables to decide the type of trap, then use the Trap Damage Severity tables to decide how deadly it should be. For more information on trap damage

–07 Collapsing staircase creates a ramp that deposits characters into a pit at its lower end 08–10 Ceiling block falls, or entire ceiling collapses 11–12 Ceiling lowers slowly in locked room 13–14

3. False Entrance

Compendium - Sources->Dungeons & Dragons->Tomb of Annihilation

its turns. After 10 rounds, the gas valves close and the stone block rises back into the ceiling. Any puzzle cubes still in their cavities are pushed out, and the trap resets. Any character searching

over the tunnel entrance. Any character in the tunnel must decide whether to stay or to flee, which requires a successful DC 10 Strength (Athletics) check. Characters who stay or who fail the check

Hungry Ogres

Compendium - Sources->Dungeons & Dragons->Storm Lord’s Wrath

grumpy around goats, the ogres decide to attack. Assuming some of the characters are sleeping for the night, anyone on guard duty can attempt a DC 15 Wisdom (Animal Handling) or Wisdom (Insight

) check to notice that the goats are getting restless. This gives those on guard three rounds to wake up any sleepers and take precautions. After three rounds, the ogres, numbering three plus one per

Harshnag's Sacrifice

Compendium - Sources->Dungeons & Dragons->Storm King's Thunder

does his utmost to keep Iymrith from fleeing by attempting to grapple her on later turns. After falling debris deals damage for 2 rounds, the ceiling collapses the next time initiative reaches 0

(specifically her tail attack and wing attack) against the characters. Harshnag quickly becomes annoyed with the adventurers’ refusal to leave. If they linger in area 6 for more than 2 rounds, Harshnag

45. Mictlan

Compendium - Sources->Dungeons & Dragons->Tales from the Yawning Portal->a3

struggling to roll a boulder up the hill, while a devil drives them on. Above the hill in the ceiling is a glowing spot that illuminates the entire chamber with an eerie silver light. A cobblestone path

corner of the room. Within this dark chasm, worms pursue the fleeing forms of naked people. In the south corner of the room on the eastern wall is a barred door. The light in the ceiling comes from

Dead Spiders

Compendium - Sources->Dungeons & Dragons->Borderlands Quest: Goblin Trouble

for several minutes before the passage turns north and leads up a set of natural stone steps. A group of caverns continues out ahead of you. The ceiling of these caverns is choked with webs, and the

footprints you’ve been following continue through these caves. In the center of the floor in the first cave is a human-sized boot. The ceiling is 15 feet high, but the webs cover the top five feet of

Architecture

Compendium - Sources->Dungeons & Dragons->Waterdeep: Dungeon of the Mad Mage

features; for example, level 16, the Crystal Labyrinth, has walls, floors, and ceilings made of crystal. Ceilings It’s helpful to know the height of a ceiling, particularly if creatures in the area can

climb or fly. Rooms. A room’s ceiling is at least as high as the room is wide, often higher. If a room’s ceiling height isn’t specified in the text, assume it’s the minimum height. Tunnels. A tunnel’s

Wandering Monsters

Compendium - Sources->Dungeons & Dragons->Waterdeep: Dungeon of the Mad Mage

two attached to the ceiling, approach the party and attack the first adventurers to come within reach of their mucus-coated tentacles. If a carrion crawler paralyzes a character with its tentacles, it

continues to make bite attacks against that character on subsequent rounds as it feeds. The carrion crawlers are too stupid and hungry to flee in the face of certain death. Goblin Skull-Hunters Pibble

24. Sandbox

Compendium - Sources->Dungeons & Dragons->Tales from the Yawning Portal->a3

grating on stone. Small panels near the ceiling move to expose four holes the size of a human fist on each wall. Dust trickles from the holes. After another 5 rounds passes, golden sand starts to pour

24. Sandbox The two thick lines on the map mark the boundaries of a trap. A character who examines the ceiling 20 feet overhead as the party passes under one of the marked areas and makes a

29. The Valves of Mithral

Compendium - Sources->Dungeons & Dragons->Tales from the Yawning Portal->a7

in 6 rounds, and each round thereafter it will rise higher and encompass one more step. If unchecked, the flow of blood will fill the foyer to the ceiling in 20 rounds. Fire of any sort, magical or

halts the flow for 3 rounds. Create or destroy water turns the blood to water. Disintegrate destroys all the blood. Levitate coagulates the blood and causes it to rise up as a Huge red ochre jelly

A Deep Dragon's Lair

Compendium - Sources->Dungeons & Dragons->Fizban's Treasury of Dragons

, walls, and ceiling covered in carpets of mold and moss, or featuring larger mushrooms and plants in neatly organized displays. The challenge rating of a legendary deep dragon increases by 1 when

it’s encountered in its lair. Lair Actions On initiative count 20 (losing initiative ties), the dragon can take one of the following lair actions; the dragon can’t take the same lair action two rounds in

Scenario 2: Waves of Undead

Compendium - Sources->Dungeons & Dragons->Ghosts of Saltmarsh

when the current fight is over, or subsequent waves will move through it freely. Alternatively, you might decide that a door is too damaged to be repaired. Wave 1 Six drowned blades rush to assault

the door into area 4. If they cannot break down the door within 3 rounds, any survivors of the characters’ defensive efforts switch their attention to the door that leads into area 21. Wave 2 Five

Ancient Topaz Dragon

Monsters Fizban's Treasury of Dragons

from the ceiling, giving the place a warm, cozy glow. (The lanterns might be magical or maintained by minions.) The floors are covered with plush sand-colored carpets. Hoard Chamber. A small chamber in

initiative count 20 (losing initiative ties), the dragon can take one of the following lair actions; the dragon can’t take the same lair action two rounds in a row: Beguiling Whisper. The dragon

Duration

Compendium - Sources->Dungeons & Dragons->Basic Rules (2014)

Duration A spell's duration is the length of time the spell persists. A duration can be expressed in rounds, minutes, hours, or even years. Some spells specify that their effects last until the

breath, you make a separate saving throw for each source of damage. Being incapacitated or killed. You lose concentration on a spell if you are incapacitated or if you die. The DM might also decide

Duration

Compendium - Sources->Dungeons & Dragons->Player's Handbook (2014)

Duration A spell’s duration is the length of time the spell persists. A duration can be expressed in rounds, minutes, hours, or even years. Some spells specify that their effects last until the

breath, you make a separate saving throw for each source of damage. Being incapacitated or killed. You lose concentration on a spell if you are incapacitated or if you die. The DM might also decide

20. False Tomb

Compendium - Sources->Dungeons & Dragons->Tomb of Annihilation

20. False Tomb Nested in the ceiling of the western tunnel is a stone block. A character who searches the tunnel spots the block with a successful DC 15 Wisdom (Perception) check. The block is part

of the room’s trap (see “Trap” below). This room smells of wine. On a checkerboard marble floor, a gilded coffin sparkles in sunlight streaming down from the chamber’s vaulted ceiling, which arches

6. Frog Lake

Compendium - Sources->Dungeons & Dragons->Tyranny of Dragons

6. Frog Lake Pharblex and the bullywugs raise giant frogs in this water-filled cavern. The ceiling arches 30 feet overhead. The floor of the pool drops off suddenly from the shore, with the water

. Characters hear more croaking and at least a dozen splashes from area 7. If they are still in area 6 or area 7 after 2 rounds, they are attacked by twelve giant frogs. The frogs focus their attacks

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