Oaken Sentinel — fantasy monster illustration. Oaken Sentinel is a huge plant (Challenge Rating 10).

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Oaken Sentinel

Huge Plant, unaligned

AC
16
HP
189
Speed
10
CR
10

Armor Class 16 (natural armor)

Hit Points 189 (18d12+72)

Speed 10 ft.


STR
22 (+6)
DEX
6 (-2)
CON
19 (+4)
INT
5 (-3)
WIS
8 (-1)
CHA
3 (-4)

Skills Perception -1

Damage Vulnerabilities lightning

Damage Resistances bludgeoning, piercing

Condition Immunities blinded, deafened, frightened, prone

Senses blindsight 120' (blind beyond), passive Perception 9

Languages Sylvan

Challenge 10


Traits

False Appearance. While motionless indistinguishable from ordinary oak tree.

Grasping Branches. Can have up to six Grasping Branches at a time. Each Grasping Branch can be attacked (AC 16; 25 hp; vulnerability to lightning; immunity to poison and psychic). Destroying a Grasping Branch deals no damage to the oaken sentinel which can extend a replacement branch on its next turn. A Grasping Branch can also be broken if a creature takes an action and succeeds on a DC 16 Str check vs. it.

Actions

Multiattack. Three Grasping Branch or Rock attacks. It can replace one attack with use of Fling.

Grasping Branch. Melee Weapon Attack: +10 to hit, 50 ft., one target, 19 (3d8+6) bludgeoning damage and the target is grappled (escape DC 16). Until the grapple ends the target is restrained and takes 4 (1d8) bludgeoning damage at start of each of its turns and sentinel can't use same Grasping Branch on another target.

Rock. Ranged Weapon Attack: +10 to hit 60/240' one target 22 (3d10+6) bludgeoning damage.

Fling. One Med or smaller creature grappled by the oaken sentinel is thrown up to 60' in a random direction and knocked prone. If a thrown target strikes a solid surface the target takes 3 (1d6) bludgeoning damage for every 10 ft. it was thrown. If the target is thrown at another creature that creature must make DC 16 Dex save or take the same damage and be knocked prone.

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Oaken 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