Hivequeen

Large plant, decomposer, unaligned

Armor Class 12

Hit Points 25 (3d10+9)

Speed 20ft Burrow: 20ft

STR

12 +1

DEX

12 +1

CON

16 +3

INT

10 0

WIS

14 +2

CHA

11 0

Saving Throws Wisdom +4, Charisma +3

Senses Tremorsense 30ft.
Darkvision 60ft.
Passive perception 12

Challenge 1/4

Swarm caller
The Hivequeen controls a number of tiny insect swarms equal to its Wisdom modifier.
The Hivequeen can perceive through the senses of its swarms and its own senses simultaneously.
The Hivequeen controls the swarms on their turn and can command them to either attack, dealing 4 piercing damage or to distract, imposing disadvantage on attack rolls.
The Hivequeen can use its own action to mark an enemy, granting advantage on the next roll made against it.

Actions

Claw
Melee Weapon Attack: +3 to hit, reach 10ft., one target
On Hit: 3 (1d4+1) piercing damage, if the target is a creature, it must succeed on a DC 12 Dex Save or be grappled. (The Hivequeen can grapple up to 2 medium or smaller creatures)

This strange plant grows itself into a perfect hive, attracting various insects to take up residence inside it, which it then controls with a low-level psionic field.
Despite their degree of control over their resident swarms, the relationship is mutually beneficial. The insects provide protection and food and the Plant provides a perfect place to live and sugary sap to eat.
They exhibit a wide range of physiologies but generally resemble a hermit crab of sorts, their 'shell' a large hive, suited to the type of insect they are housing.