Underworld Sentinel — fantasy monster illustration. Underworld Sentinel is a huge undead (Challenge Rating 10).

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Underworld Sentinel

Huge Undead, neutral

AC
17
HP
126
Speed
40
CR
10

Armor Class 17 (natural armor)

Hit Points 126 (12d12+48)

Speed 40 ft.


STR
23 (+6)
DEX
15 (+2)
CON
18 (+4)
INT
10 (+0)
WIS
16 (+3)
CHA
14 (+2)

Saving Throws Con +8, Dex +6, Wis +7

Skills Perception +3

Damage Resistances necrotic; nonmagic B/P/S attacks

Damage Immunities poison

Condition Immunities charmed, exhaustion, poisoned

Senses blindsight 60', darkvision 120', passive Perception 17

Languages Darakhul, Giant, Undercommon

Challenge 10


Traits

Passage Guardian. 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. Is immune to effects that turn undead.

Undead Nature. Doesn't require air food drink or sleep.

Actions

Multiattack. Two Scythe or Death Knell attacks.

Scythe. Melee Weapon Attack: +10 to hit, 15 ft., one target, 17 (2d10+6) slashing damage + 10 (3d6) necrotic.

Death Knell. Ranged Spell Attack: +7 to hit, 60 ft., one target, 16 (3d8+3) necrotic or 22 (3d12+3) necrotic if the target is missing any of its hp.

Grim Reaping (Recharge 5-6). Spins with its scythe extended and makes one Scythe attack vs. each creature within its reach. A creature that takes necrotic from this attack can't regain hp until the end of its next turn.

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Underworld Sentinel — fantasy monster illustrationPrimary
FTTHelper · auto-generated · monster · monster

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Further reading

Jetpack7 Game Master Series
The Game Master's Book of Random Encounters
Jeff Ashworth · 2020
The Game Master's Book of Traps, Puzzles and Dungeons
Jeff Ashworth · 2022
The Game Master's Book of Legendary Dragons
Aaron Hübrich · 2022