Mangrove Treant — fantasy monster illustration. Mangrove Treant is a huge plant (Challenge Rating 7).

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Mangrove Treant

Huge Plant, neutral

AC
15
HP
136
Speed
30
CR
7

Gnarled roots reaching deep into the muck act as legs for this group of trees conjoined into a sentient being._
Ancient Grove Guardians. Mangrove treants provide shelter and a resource-rich environment for many creatures. They extend their roots into the water, where several species of fish thrive. Biting and stinging insects, most notably mosquitos, dart about in cloud-like formations near the water’s surface. Arboreal animals nest high among the treants’ boughs mostly removed from the depredations of the insects. Unlike their forest cousins, these swampland treants are more concerned with the safety of those under their protection and less concerned with the overall health of the swamp. They decisively react to direct threats to themselves and the creatures within their boughs and roots, but they may not act if something endangers an area outside their immediate groves.
Mangrove treants continue to grow throughout their extraordinarily long lives, which can reach millennia if they see no external disruptions. The treants also add ordinary mangrove trees into their gestalt, incorporating the trees’ ecosystems into its whole.
Friend to Lizardfolk. While a mangrove treant is generally wary of civilization, it befriends Open Game License


Armor Class 15 (natural armor)

Hit Points 136 (13d12+52)

Speed 30 ft.


STR
20 (+5)
DEX
7 (-2)
CON
19 (+4)
INT
12 (+1)
WIS
15 (+2)
CHA
12 (+1)

Skills Nature +4, Athletics +8

Senses passive Perception 12

Languages Common, Draconic, Druidic, Sylvan

Challenge 7


Traits

False Appearance. While the mangrove treant remains motionless, it is indistinguishable from an ordinary mangrove tree.

Grasping Roots. The treant has advantage on Strength and Dexterity saving throws made against effects that would knock it prone.

Siege Monster. The mangrove treant deals double damage to objects and structures.

Tiny Spies. The mangrove treant can communicate with mosquitos as if they shared a language. The mosquitos alert the treant to the presence of intruders, and the treant has advantage on Wisdom (Perception) checks to notice creatures within 60 feet of it.

Actions

Multiattack. The mangrove treant makes two slam attacks.

Slam. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 18 (3d8 + 5) bludgeoning damage.

Mangrove Mosquitos. The mangrove treant calls a swarm of mosquitos from its branches. The swarm of mosquitos uses the statistics of a swarm of insects, except it has a flying speed of 30 feet. The swarm acts an ally of the treant and obeys its spoken commands. The swarm remains for 1 day, until the treant dies, or until the treant dismisses it as a bonus action. The treant can have only one swarm of mosquitos at a time. If it calls another, the previous swarm disperses.

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Mangrove Treant — 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