A creature with the Siege Monster trait deals double damage against building and objects here’s the text:

Siege Monster
Image of a monster attacking a building courtesy of Bing Copilot

Siege Monster. The tarrasque deals double damage to objects and structures.

From the 5e Tarrasque stat block

This article was originally published January 22nd, 2024, and has been republished with updates as new monsters are added.

Siege monster is a common trait among gargantuan creatures, titans, and other big monsters. That said, you will find some medium siege monsters, and a few in between.

Creatures with the Siege Monster trait can be part of a stand-up fight against the party. The trait also suggests that this creatures focus may not be on the party. Combat involving these creatures may center on a set piece that the creature is attacking instead of the party. In these situations, the party’s goal is to defeat or redirect the monster before it can significantly damage or a target. This could be a castle they’ve been tasked with defending. It could be a boat or a caravan they are traveling in.

Another option is to make the target of this creature’s ire the object they need to destroy it. Let’s say they have a magical cannon that needs to charge for a certain number of rounds of combat before it can fire. The party members must protect the device until it is ready, and then fire it. To do so, they have to deal enough damage to it per turn to get the creatures attention.

Siege Monsters:

Creature Creature TypeChallenge RatingSource
Adult Sea DragonDragon18Tome of Beasts 1 2023
Adult Solar DragonDragon14Boo’s Astral Menagerie
AnarchHumanoid (Any Race)1/4Guildmasters’ Guide to Ravnica
Ancient Sea DragonDragon23Tome of Beasts 1 2023
Ancient Sea SerpentDragon14Fizban’s Treasury of Dragons
Ancient Solar DragonDragon21Boo’s Astral Menagerie
Animated TreePlant9Explorer’s Guide to Wildemount
Baba Lysaga’s Creeping HutConstruct11Curse of Strahd
BorborygmosGiant18Guildmasters’ Guide to Ravnica
Chardalyn DragonConstruct11Icewind Dale: Rime of the Frostmaiden
Colossus of AkrosConstruct23Mythic Odyssey of Theros
Cradle of the Cloud ScionElemental26Bigby Presents: Glory of the Giants
Cradle of the Fire ScionElemental25Bigby Presents: Glory of the Giants
Cradle of the Frost ScionElemental24Bigby Presents: Glory of the Giants
Cradle of the Hill ScionElemental22Bigby Presents: Glory of the Giants
Cradle of the Stone ScionElemental23Bigby Presents: Glory of the Giants
Cradle of the Storm ScionElemental27Bigby Presents: Glory of the Giants
Doomguard Doom LordHumanoid12Morte’s Planar Parade
Druid of the Old WaysHumanoid (Any Race)7Guildmasters’ Guide to Ravnica
Duergar HammererConstruct (Dwarf)2Mordenkainen Presents: Monsters of the Multiverse
Duke ZaltoGiant9Storm King’s Thunder
DuskwalkerPlant9Dragonlance: Shadow of the Dragon Queen
Earth ElementalElemental5Monster Manual
Earth Totem ElementalElemental5Plane Shift: Ixalan
Elder Brain DragonAberration22Fizban’s Treasury of Dragons
Elder DinosaurMonstrosity (Titan)30Plane Shift: Ixalan
Elder Dinosaur (Etali, Primal Storm)Monstrosity (Titan)30Plane Shift: Ixalan
Elder Dinosaur (Ghalta, Primal Hunger)Monstrosity (Titan)30Plane Shift: Ixalan
Elder Dinosaur (Nezahal, Primal Tide)Monstrosity (Titan)30Plane Shift: Ixalan
Elder Dinosaur (Tetzimoc, Primal Death)Monstrosity (Titan)30Plane Shift: Ixalan
Elder Dinosaur (Zacama, Primal Calamity)Monstrosity (Titan)30Plane Shift: Ixalan
Elder Dinosaur (Zetalpa, Primal Dawn)Monstrosity (Titan)30Plane Shift: Ixalan
Elder TempestElemental23Mordenkainen Presents: Monsters of the Multiverse
Elemental LocusElemental17Tome of Beasts 1 2023
Empyrean Brazen BullCelestial10Lairs of Etharis
EmrakulMonstrosity (Titan)30Plane Shift: Zendikar
Fiendish AugerConstruct5Phandelver and Below: The Shattered Obelisk
Flesh ColossusConstruct20Bigby Presents: Glory of the Giants
Giff Shock TrooperHumanoid6Boo’s Astral Menagerie
GoristroFiend (Demon)17Monster Manual
Grandfather OakPlant9Infernal Machine Rebuild
Granite JuggernautConstruct12Vecna: Eve of Ruin
IsonadeMonstrosity14Tome of Beasts 1 2023
KozilekMonstrosity (Titan)23Plane Shift: Zendikar
KrakenMonstrosity (Titan)23Monster Manual
LeviathanElemental20Mordenkainen Presents: Monsters of the Multiverse
Malformed KrakenMonstrosity10Tales from the Yawning Portal
Modron Planar IncarnateFiend22Turn of Fortune’s Wheel
Murder CometElemental5Boo’s Astral Menagerie
Nightmare BeastMonstrosity16Monstrous Compendium Vol. 1: Spelljammer Creatures
OakheartPlant8Humblewood Campaign Setting
Ogre Battering RamGiant4Mordenkainen Presents: Monsters of the Multiverse
OgrémochElemental20Princes of the Apocalypse
PhoenixElemental16Mordenkainen Presents: Monsters of the Multiverse
Planar IncarnateCelestial or Fiend22Morte’s Planar Parade
PolukranosMonstrosity19Mythic Odyssey of Theros
RedbudPlant9Vecna: Eve of Ruin
Rubblebelt StalkerHumanoid (Any Race)1/4Guildmasters’ Guide to Ravnica
Ruin GrinderConstruct5Strixhaven: Curriculum of Chaos
Runic ColossusConstruct21Bigby Presents: Glory of the Giants
Sahuagin Coral SmasherHumanoid (Sahuagin)1Ghosts of Saltmarsh
Sathaq WormElemental10Tome of Beasts 1 2023
Scion of GrolantorGiant (Titan)22Bigby Presents: Glory of the Giants
Scion of MemnorGiant (Titan)26Bigby Presents: Glory of the Giants
Scion of SkoraeusGiant (Titan)23Bigby Presents: Glory of the Giants
Scion of StronmausGiant (Titan)27Bigby Presents: Glory of the Giants
Scion of SurturGiant (Titan)25Bigby Presents: Glory of the Giants
Scion of ThrymGiant (Titan)24Bigby Presents: Glory of the Giants
SlarkrethelMonstrosity (Titan)25Storm King’s Thunder
Spinosaurus DinosaurBeast13Tome of Beasts 1 2023
Stone JuggernautConstruct12Tomb of Annihilation
Sunder ShamanGiant10Guildmasters’ Guide to Ravnica
TarrasqueMonstrosity (Titan)30Monster Manual
TreantPlant9Monster Manual
Treant Totem ElementalPlant9Plane Shift: Ixalan
Tree BlightPlant7Curse of Strahd
TromokratisMonstrosity (Titan)26Mythic Odyssey of Theros
TurlangPlant9Storm King’s Thunder
UdaakFiend16Explorer’s Guide to Wildemount
Undead TreeUndead9Baldur’s Gate: Descent into Avernus
Walking Statue of WaterdeepConstruct18Waterdeep Dragon Heist 
Warforged ColossusConstruct25Eberron: Rising from the Last War
Warforged TitanConstruct8Eberron: Rising from the Last War
Weeping TreantPlant6Tome of Beasts 1 2023
WurmMonstrosity14Guildmasters’ Guide to Ravnica
Ychen BannogBeast11Tome of Beasts 1 2023
Young Sea DragonDragon9Tome of Beasts 1 2023
Young Sea SerpentDragon8Fizban’s Treasury of Dragons
ZaratanElemental22Mordenkainen Presents: Monsters of the Multiverse

Now that you’ve got some siege monsters, how about some maps to put them on?

Categories: Ability Check

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