Creatures with regeneration have the ability to regain hit points at the start of their turns. They only die if they start their next turn with 0 hit points. I’ve quoted the text from the troll stat block below:

The troll has regeneration
A troll from the D&D 5e Basic Rules

Regeneration.

The troll regains 10 hit points at the start of its turn. If the troll takes acid or fire damage, this trait doesn’t function at the start of the troll’s next turn. The troll dies only if it starts its turn with 0 hit points and doesn’t regenerate.

DnD 5e Basic Rules

Typically, a specific type of damage (e.g. fire, acid, radiant, etc.) is required to prevent the creature from regenerating and actually kill it. It is entirely possible that a party of adventurers may either lack the ability to deal the damage needed. They also might just not figure out what they need to do. This can lead to a pretty dramatic fight where they party is forced to flee. They’ll need to hit the books to better understand the creature they are fighting.

As for the monsters, I think they might just get scared when they stop regenerating. Maybe it’s the first time they’ve actually been hurt. I’d bet they’d run away…or be driven mad with rage.

Creatures With Regeneration:

CreatureTypeChallenge RatingSource
Advanced Detention DroneConstruct7The Book of Many Things
Aquatic TrollGiant5Tyranny of Dragons
BaelFiend19Mordenkainen Presents: Monsters of the Multiverse
BelashyrraAberration22
Eberron: Rising from the Last War
Blue SlaadAberration7Monster Manual
Bore WormConstruct16Waterdeep: Dungeon of the Mad Mage
Boss AugustusMonstrosity9The Book of Many Things
Boss DelourMonstrosity9The Book of Many Things
Cloud GiantUndead9Candlekeep Mysteries
Death SlaadAberration10Monster Manual
Devkarin LichUndead14Guildmasters’ Guide to Ravnica
Dire TrollGiant13Mordenkainen Presents: Monsters of the Multiverse
Dragonflesh AbominationMonstrosity6Fizban’s Treasury of Dragons
DyrrnAberration24
Eberron: Rising from the Last War
Elf VampireUndead19Lairs of Etharis
Fensir DevourerCelestial8Bigby Presents: Glory of the Giants
Fensir SkirmisherGiant6Bigby Presents: Glory of the Giants
Five-Armed TrollGiant8Waterdeep: Dungeon of the Mad Mage
Four-Armed TrollGiant6Tyranny of Dragons
Frost Giant Everlasting OneGiGiant12Mordenkainen Presents: Monsters of the Multiverse
FzegMonstrosity16Lairs of Etharis
FzeglaichMonstrosity7Lairs of Etharis
GeryonFiend22Mordenkainen Presents: Monsters of the Multiverse
Glasswork GolemConstruct2The Wild Beyond the Witchlight
Gnoll VampireUndead8Icewind Dale: Rime of the Frostmaiden
Gray SlaadAberration9Monster Manual
Green SlaadAberration8Monster Manual
Hourglass WidowUndead20Lairs of Etharis
HutijinFiend21Mordenkainen Presents: Monsters of the Multiverse
Ice TrollGiant8Icewind Dale: Rime of the Frostmaiden
Ice TrollGiant5Tyranny of Dragons
JabberwockDragon13The Wild Beyond the Witchlight
Jarad Vod SavoUndead22Guildmasters’ Guide to Ravnica
JuiblexFiend23Mordenkainen Presents: Monsters of the Multiverse
Knight of the OrderUndead5Curse of Strahd
Kobold Vampire SpawnUndead3Icewind Dale: Rime of the Frostmaiden
Lich TrollUndead14Lairs of Etharis
Living DollConstruct2The Wild Beyond the Witchlight
Loup GarouMonstrosity13Van Richten’s Guide to Ravenloft
Mighty Servant of Leuk-oConstructUnknownTasha’s Cauldron of Everything
MolochFiend21Mordenkainen Presents: Monsters of the Multiverse
NosferatuUndead8Van Richten’s Guide to Ravenloft
OniGiant7Monster Manual
Pest MascotMonstrosity1/4Strixhaven: Curriculum of Chaos
Red SlaadAberration5Monster Manual
Regenerating Black PuddingOoze5Out of the Abyss
Relentless JuggernautFiend12Van Richten’s Guide to Ravenloft
RevenantUndead5Monster Manual
ScragGiant5Tales from the Yawning Portal
Shield GuardianConstruct7Monster Manual
Spawn of KyussUndead5Mordenkainen Presents: Monsters of the Multiverse
Spirit TrollGiant11Mordenkainen Presents: Monsters of the Multiverse
Stone JuggernautConstruct12Tomb of Annihilation
The BagmanGiant5Van Richten’s Guide to Ravenloft
Thorny VegepygmyPlant1Mordenkainen Presents: Monsters of the Multiverse
TitivilusFFiend16Mordenkainen Presents: Monsters of the Multiverse
TlexolotlElemental10Journeys through the Radiant Citadel
TrollGiant5Monster Manual
Troll AmalgamGiant17Bigby Presents: Glory of the Giants
Troll MutateGiant7Bigby Presents: Glory of the Giants
TyphonMonstrosity15Mythic Odyssey of Theros
VampireUndead13Monster Manual
Vampire SpawnUndead5Monster Manual
Vampire SpellcasterUndead15Monster Manual
Vampire WarriorUndead15Monster Manual
VegepygmyPlant0.25Mordenkainen Presents: Monsters of the Multiverse
Vegepygmy ChiefPlant2Mordenkainen Presents: Monsters of the Multiverse
Venom TrollGiant7Mordenkainen Presents: Monsters of the Multiverse
WereravenHumanoid2Van Richten’s Guide to Ravenloft
WerevultureFiend4The Book of Many Things
WitherbloomHumanoid2Strixhaven: Curriculum of Chaos
Witherbloom PledgemageHumanoid4Strixhaven: Curriculum of Chaos
Wood WoadPlant5Mordenkainen Presents: Monsters of the Multiverse
Yellow Musk CreeperPlant2Tomb of Annihilation
Young WereravenHumanoid2Curse of Strahd
ZarielFiend26Mordenkainen Presents: Monsters of the Multiverse
Zombie TrollUndead4Lairs of Etharis

Maybe your players need some nice magic items to help them?


Categories: Ability Check

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