Underworld Sentinel

Huge undead, neutral

Armor Class 17 (natural armor)
Hit Points 126 (12d12 + 48)
Speed 40 ft.

23 (+6) 15 (+2) 18 (+4) 10 (+0) 16 (+3) 14 (+2)

Saving Throws Dex +6, Con +8, Wis +7
Skills Athletics +10, Perception +7, Religion +4
Damage Resistances necrotic; bludgeoning, piercing, and slashing from nonmagical attacks
Damage Immunities poison
Condition Immunities charmed, exhaustion, poisoned
Senses blindsight 60 ft., darkvision 120 ft., passive Perception 17
Languages Darakhul, Giant, Undercommon
Challenge 10 (5,900 XP)
Proficiency Bonus +4


  • Passage Guardian. The underworld sentinel can make an opportunity attack when a hostile creature moves within its reach as well as when a hostile creature moves out of its reach. It gets one extra reaction that be used only for opportunity attacks.
  • Turn Immunity. The underworld sentinel is immune to effects that turn undead.
  • Undead Nature. The underworld sentinel doesn’t require air, food, drink, or sleep.


  • Multiattack. The sentinel makes two Scythe or Death Knell attacks.
  • Scythe. Melee Weapon Attack: +10 to hit, reach 15 ft., one target. Hit: 17 (2d10 + 6) slashing damage plus 10 (3d6) necrotic damage.
  • Death Knell. Ranged Spell Attack: +7 to hit, range 60 ft., one target. Hit: 16 (3d8 + 3) necrotic damage, or 22 (3d12 + 3) necrotic damage if the target is missing any of its hit points.
  • Grim Reaping (Recharge 5–6). The underworld sentinel spins with its scythe extended and makes one Scythe attack against each creature within its reach. A creature that takes necrotic damage from this attack can’t regain hp until the end of its next turn.


A huge, emaciated giant stands guard, its dark grey skin covered in glowing eldritch runes and spiral patterns. It holds an enormous scythe in its bony hands.

Underworld sentinels are undead giants sworn to serve the gods of death and undeath. They stand guard over necropolises, cemeteries, and the subterranean temples of the ghoul gods.

Others watch over the entrances to the realms of the dead beneath the earth, charged with stopping the inhabitants from leaving—or the living from entering in the hope of rescuing the spirit of a loved one. Whatever their orders, underworld sentinels remain steadfast in their devotion to their dark gods and unswerving in their resolve to defend their posts.

Dark Origins. Centuries ago, a sinister cult dedicated to the deity of death arose among a clan of deep-dwelling stone giants. Heeding the pronouncements of a herald of undeath, the giants gave up their natural lives in exchange for immortality and unholy power. Carving runes and symbols into their bodies in a dark ritual, they were transformed into the first underworld sentinels. In the many years that followed, underworld sentinels spread throughout the world. Some enter the service of liches or mummy lords as guardians, while others dedicate themselves to protecting a shrine or temple to a deity of death or undeath.

Section 15: Copyright Notice

Tome of Beasts 3 © 2022 Open Design LLC; Authors: Eytan Bernstein, Celeste Conowitch, Benjamin L. Eastman, Robert Fairbanks, Scott Gable, Basheer Ghouse, Richard Green, Jeremy Hochhalter, Jeff Lee, Christopher Lockey, Sarah Madsen, Ben Mcfarland, Jonathan Miley, Kelly Pawlik, Sebastian Rombach, Chelsea Steverson, Brian Suskind, Mike Welham

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