monster set with once area for for layer

Alarm

Spells Player’s Handbook

You set an alarm against intrusion. Choose a door, a window, or an area within range that is no larger than a 20-foot Cube. Until the spell ends, an alarm alerts you whenever a creature touches or

enters the warded area. When you cast the spell, you can designate creatures that won’t set off the alarm. You also choose whether the alarm is audible or mental: Audible Alarm. The alarm

Commune with Nature

Spells Player’s Handbook

, you could determine the location of a powerful monster in the area, the locations of bodies of water, and the locations of any towns.

You commune with nature spirits and gain knowledge of the surrounding area. In the outdoors, the spell gives you knowledge of the area within 3 miles of you. In caves and other natural underground

Glyph of Warding

Spells Player’s Handbook

) to conceal the glyph. The glyph can cover an area no larger than 10 feet in diameter. If the surface or object is moved more than 10 feet from where you cast this spell, the glyph is broken, and the

spell ends without being triggered. The glyph is nearly imperceptible and requires a successful Wisdom (Perception) check against your spell save DC to notice. When you inscribe the glyph, you set

Helm of Brilliance

Magic Items Dungeon Master’s Guide

This helm is set with 1d10 diamonds, 2d10 rubies, 3d10 fire opals, and 4d10 opals. Any gem pried from the helm crumbles to dust. When all the gems are removed or destroyed, the helm loses its magic

. You gain the following benefits while wearing the helm. Diamond Light. As long as it has at least one diamond, the helm emits a 30-foot Emanation. When at least one Undead is within that area, the

Otiluke's Freezing Sphere

Spells Player’s Handbook

A frigid globe streaks from you to a point of your choice within range, where it explodes in a 60-foot-radius Sphere. Each creature in that area makes a Constitution saving throw, taking 10d6 Cold

damage on failed save or half as much damage on a successful one. If the globe strikes a body of water, it freezes the water to a depth of 6 inches over an area 30 feet square. This ice lasts for 1

Symbol

Spells Player’s Handbook

You inscribe a harmful glyph either on a surface (such as a section of floor or wall) or within an object that can be closed (such as a book or chest). The glyph can cover an area no larger than 10

. The glyph is nearly imperceptible and requires a successful Wisdom (Perception) check against your spell save DC to notice. When you inscribe the glyph, you set its trigger and choose which effect the

Staff of Power

Magic Items Dungeon Master’s Guide

must expend to cast the spell. Spell Charge Cost Cone of Cold 5 Fireball (level 5 version) 5 Globe of Invulnerability 6 Hold Monster 5 Levitate 2 Lightning

charges in the staff . Each other creature in the area makes a DC 17 Dexterity saving throw. On a failed save, a creature takes Force damage equal to 4 times the number of charges in the staff . On a successful save, a creature takes half as much damage.

Deck of Illusions

Magic Items Dungeon Master’s Guide

This box contains a set of cards. A full deck has 34 cards: 32 depicting specific creatures and two with a mirrored surface. A deck found as treasure is usually missing 1d20 − 1 cards. The

91–93 Warrior Veteran 94–96 Wyvern 97–00 The card drawer *Stat blocks for these creatures (except the card drawer) appear in the Monster Manual.

Tarrasque

Monsters Monster Manual

":"Reflective Carapace"}. On a 1–5, the tarrasque is unaffected. On a 6, the tarrasque is unaffected and reflects the spell, turning the caster into the target. Siege Monster. The tarrasque deals

of this movement, the tarrasque creates an instantaneous shock wave in a 60-foot Emanation originating from itself. Creatures in that area lose Concentration and, if Medium or smaller, have the Prone

Demonomicon of Iggwilv

Magic Items Dungeon Master’s Guide

Fiend that you can see that is trapped within the area of a Magic Circle spell. The Fiend must succeed on a DC 20 Charisma saving throw with Disadvantage or become trapped within one of the Demonomicon

those hours pass, anyone who opens the book’s remaining binding is transported to a nascent layer of the Abyss that lies hidden within the book. At the heart of this deadly, semisentient domain

Crown of Horns

Magic Items Forgotten Realms: Adventures in Faerûn

The Crown of Horns contains the essence and intelligence of Myrkul, one of the Dead Three. This ghastly crown is a pale silver circlet with four curved bones set around its rim. On the crown's brow

is set a black diamond whose depths swirl with weird, malignant energy. Myrkul created the Crown of Horns at the height of his power. When Myrkul was slain by Mystra, he imbued the crown with his

Earth Elemental Legacy

Monsters Basic Rules (2014)

Earth Glide. The elemental can burrow through nonmagical, unworked earth and stone. While doing so, the elemental doesn't disturb the material it moves through. Siege Monster. The elemental deals

hill, club-like arms of jagged stone swinging at its sides. Its head and body consist of dirt and stone, occasionally set with chunks of metal, gems, and bright minerals.PoisonBludgeoning, Piercing, and Slashing from Nonmagical AttacksThunder

Alarm Legacy

Spells Basic Rules (2014)

You set an alarm against unwanted intrusion. Choose a door, a window, or an area within range that is no larger than a 20-foot cube. Until the spell ends, an alarm alerts you whenever a Tiny or

larger creature touches or enters the warded area. When you cast the spell, you can designate creatures that won't set off the alarm. You also choose whether the alarm is mental or audible. A mental alarm

Juiblex

Monsters Mordenkainen Presents: Monsters of the Multiverse

layer of the Abyss, which is also known as Shedaklah, is a bubbling morass of fetid sludge. The landscape is covered in vast expanses of caustic slimes, and strange organic forms rise from the oceans of

Juiblex chooses within the lair. The slime disintegrates after 1 hour. Slippery Slime. Juiblex slimes a square area of ground it can see within the lair. The area can be up to 10 feet on a side. When

Dust of Corrosion

Magic Items The Wild Beyond the Witchlight

As an action, you can throw this dust into the air, filling a 10-foot cube that extends out from you. Surfaces and objects made of nonmagical ferrous metal in the area instantly corrode and turn to

dust, becoming useless and unsalvageable. Any creature in the area that is made wholly or partly out of ferrous metal must make a DC 13 Constitution saving throw, taking 4d8 necrotic damage on a failed

Fire Hellion

Monsters Bigby Presents: Glory of the Giants

soul rises as a lemure (see the Monster Manual) on Avernus, one of the Nine Hells, in 1d4;{"diceNotation":"1d4", "rollType":"roll", "rollAction":"Hours"} hours. If the creature isn’t revived

in a 20-foot-radius sphere centered on a point the hellion can see within 120 feet of itself. The sphere spreads around corners. Each creature in that area must make a DC 17 Dexterity saving throw. A

Magmin Legacy

Monsters Basic Rules (2014)

area are ignited. Ignited Illumination. As a bonus action, the magmin can set itself ablaze or extinguish its flames. While ablaze, the magmin sheds bright light in a 10-foot radius and dim light for

Juiblex Legacy

Monsters Out of the Abyss

creature enters the area for the first time on a turn or ends its turn there, that creature must make the same save.If the slime is set on fire, it burns away after 1 round. Any creature that starts its

known as the Slime Pits, a realm which Juiblex shares with Zuggtmoy. This layer of the Abyss, which is also known as Shedaklah, is a bubbling morass of oozing, fetid sludge. Its landscape is covered

Orcus

Monsters Mordenkainen Presents: Monsters of the Multiverse

with a 10-foot radius rises from that point and lasts until the end of Orcus’s next turn. Creatures in that area have vulnerability to necrotic damage.Orcus is the Demon Prince of Undeath, also

become ghoul;ghouls and zombie;zombies (both appear in the Monster Manual) that serve in his legions, while his favored servants are the cultists and necromancers who murder the living and then manipulate

Aurnozci

Monsters The Book of Many Things

, or half as much damage on a successful one.The demon lord Aurnozci is a wormlike horror of fiery flesh and toxic seepage. In its present form, Aurnozci can’t leave Xulregg, the Abyssal layer

"} fire damage when it enters the ashes’ space for the first time on a turn or starts its turn there. Aurnozci’s Lair Aurnozci’s lair is a layer of the Abyss called Xulregg. See

Dragonflesh Grafter

Monsters Fizban's Treasury of Dragons

", "rollType":"recharge", "rollAction":"Acid Retch"}. The grafter retches forth a spray of acidic bile in a 30-foot cone. Each creature in that area must make a DC 12 Dexterity saving throw, taking 14 (4d6

a hulking fusion of draconic and bipedal characteristics, standing between 8 and 12 feet tall. As its original nature wanes, its draconic powers grow, giving it a thick layer of dragon scale armor

Tower Sage

Monsters Quests from the Infinite Staircase

cone. Each creature in that area must succeed on a DC 13 Constitution saving throw or have the blinded condition until the end of the tower sage’s next turn. Spellcasting. The tower sage casts

elder sage. Tower sages are the only folk capable of reading the Books of Prophecy, an ancient set of tomes that hint at future events of grand significance. Tower Stewards For centuries, the Tower of the Heavens has been stewarded by dutiful folk who practice two distinct traditions.

Bel

Monsters Baldur’s Gate: Descent into Avernus

spellcasting ability is Charisma (spell save DC 23). Bel can innately cast the following spells, requiring no material components: At will: detect magic, fireball 3/day each: dispel magic, hold monster

);ice devil with an ice spear (as described in the ice devil’s entry in the Monster Manual). The ice devil appears in an unoccupied space within 60 feet of Bel, acts as Bel’s ally, and can

Helm of Brilliance Legacy

Magic Items Basic Rules (2014)

This dazzling helm is set with 1d10 diamonds, 2d10 rubies, 3d10 fire opals, and 4d10 opals. Any gem pried from the helm crumbles to dust. When all the gems are removed or destroyed, the helm loses

one diamond, the helm emits dim light in a 30-foot radius when at least one undead is within that area. Any undead that starts its turn in that area takes 1d6 radiant damage. As long as the helm has

Glyph of Warding Legacy

Spells Basic Rules (2014)

be closed (such as a book, a scroll, or a treasure chest) to conceal the glyph. The glyph can cover an area no larger than 10 feet in diameter. If the surface or object is moved more than 10 feet from

trigger so the spell activates only under certain circumstances or according to physical characteristics (such as height or weight), creature kind (for example, the ward could be set to affect aberrations

Nightmare Shepherd

Monsters Mythic Odysseys of Theros

Sunlight Weakness; see the Monster Manual) arise in unoccupied spaces within 20 feet of the shepherd. The shadows act right after the shepherd on the same initiative count and fight until they’re

plane might consider it a rarity from some undiscovered Abyssal layer. In general, feel free to use whatever fiends you wish when telling stories in Theros—the Underworld’s a big place with room for all the incarnate wickedness you desire. PoisonCold, Necrotic

Mind Flayer Legacy

Monsters Monster Manual (2014)

Intelligence (spell save DC 15). It can innately cast the following spells, requiring no components: At will: detect thoughts, levitate 1/day each: dominate monster, plane shift (self only)Tentacles

flayer magically emits psychic energy in a 60-foot cone. Each creature in that area must succeed on a DC 15 Intelligence saving throw or take 22 (4d8 + 4);{"diceNotation":"4d8+4","rollType":"damage

Bag of Beans Legacy

Magic Items Basic Rules (2014)

, extending from the beans. Each creature in the area, including you, must make a DC 15 Dexterity saving throw, taking 5d4 fire damage on a failed save, or half as much damage on a successful one. The

fire ignites flammable objects in the area that aren't being worn or carried. If you remove a bean from the bag, plant it in dirt or sand, and then water it, the bean produces an effect 1 minute later

Freezing Sphere Legacy

Spells Basic Rules (2014)

A frigid globe of cold energy streaks from your fingertips to a point of your choice within range, where it explodes in a 60-foot-radius sphere. Each creature within the area must make a Constitution

including water-based creatures), it freezes the liquid to a depth of 6 inches over an area 30 feet square. This ice lasts for 1 minute. Creatures that were swimming on the surface of frozen water

Programmed Illusion Legacy

Spells Basic Rules (2014)

illusion can be activated again. The triggering condition can be as general or as detailed as you like, though it must be based on visual or audible conditions that occur within 30 feet of the area

. For example, you could create an illusion of yourself to appear and warn off others who attempt to open a trapped door, or you could set the illusion to trigger only when a creature says the correct

Otiluke's Freezing Sphere Legacy

Spells Player’s Handbook (2014)

A frigid globe of cold energy streaks from your fingertips to a point of your choice within range, where it explodes in a 60-foot-radius sphere. Each creature within the area must make a Constitution

including water-based creatures), it freezes the liquid to a depth of 6 inches over an area 30 feet square. This ice lasts for 1 minute. Creatures that were swimming on the surface of frozen water

Ancient Dragon Turtle

Monsters Fizban's Treasury of Dragons

–6);{"diceNotation":"1d6","rollType":"recharge","rollAction":"Steam Breath"}. The dragon turtle exhales steam in a 90-foot cone. Each creature in that area must make a DC 24 Constitution saving throw

magic is intimately linked with the oceans of the Material Plane. The dragon turtle presented in the Monster Manual is a typical adult, at least a century old and boasting a valuable hoard. You can

Zindar

Monsters Tomb of Annihilation

slots): detect thoughts, knock 3rd level (3 slots): clairvoyance, tongues 4th level (3 slots): dominate beast, stoneskin 5th level (3 slots): hold monster, telekinesis 6th level (1 slot): true seeing

options: Fire Breath. Zindar exhales fire in a 15-foot cone. Each creature in that area must make a DC 15 Dexterity saving throw, taking 22 (4d10);{"diceNotation":"4d10","rollType":"damage

Forlarren

Monsters Mordenkainen's Fiendish Folio Volume 1

of Avernus attempted an expedition to the Feywild long ago, and the forlarren are the bitter reminder of that doomed excursion. The archdevil Fierna—co-ruler of Phlegethos, the fourth layer of the Nine

, set itself up as a petty lord, and rule over all those who fall into its grasp. A Sinister Cycle. A forlarren in its fey aspect demonstrates self-destructive urges that reflect the inherent tension in

Abhorrent Overlord

Monsters Mythic Odysseys of Theros

minute or until the overlord loses concentration (as if concentrating on a spell), and its area is lightly obscured and difficult terrain. Any creature that moves into the area for the first time on a

, while a balor meeting a Theros demon on some other plane might consider it a rarity from some undiscovered Abyssal layer. In general, feel free to use whatever fiends you wish when telling stories

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