Bramble Thorn

Regeneration. The Bramble Thorn regains 10 hit points at the start of its turn. If the Bramble Thorn takes fire damage, this trait doesn't function at the start of the Bramble Thorn's next turn. The Bramble Thorn dies only if it starts its turn with 0 hit points and doesn't regenerate.

Smoldering Body.  Once it has taken 55 points of fire damage, any creature within 5 feet of the bramble thorn takes 5 fire damage.

Tremor Sense. The Bramble Thorn can detect any ground movement within 30 feet.

Multiattack. The troll makes two attacks: one with its whip and one with its thorns.

Thorn. Ranged Weapon Attack: +7 to hit, range 30 ft., three target. Hit: 9 (1d4 + 7) piercing damage plus 10 (3d6) poison damage, DC15 Con Save.

Thorn Whip. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 11 (2d6 + 4) slashing damage.

Wicked Vines (Recharge 5-6):  Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 8 (1d8 + 4) piercing damage   If the target fails the save,  the target is grappled by thorny, poisonous vines (escape DC16) and takes 8 (1d8+4) piercing damage plus 2 (1d4) poison damage. (DC 15 Constitution Save)  Until this grapple ends, the creature is restrained and takes damage automatically at the start of each of the Bramble Thorn's turns.   The vines can be destroyed (15 hit points, AC 13).