Brambler

False Appearance. While the Brambler remains motionless, it is indistinguishable from a normal thicket of bramble

Slam. Melee Weapon Attack: +5 to hit, reach 20 ft., one target. Hit: 11 (2d6 + 4) bludgeoning damage.

Grab.  Melee Weapon Attack: +5 to hit, reach 60 ft., one target. Hit:  target must make STR 15 check or is Restrained.  Restrained creature is pulled to within 15 feet of Brambler but is otherwise immobile.  Can re-roll each round to escape.  (Restraint gives advantage to Slam attack.)

Can Attack once per turn as Action and once per round as Bonus Action.  Once per round it can also make an Opportunity Attack, which is provoked if any creature moves into or out of melee range (60 feet) or moves at least 10 feet within melee range.