Roper

False Appearance. While motionless, the roper is indistinguishable from a normal stalactite or stalagmite.

Spider Climb. The roper can climb even on difficult surfaces and upside down on ceilings.

Tendrils. The roper has eight tendrils. Each tendril has AC 20, 15 hit points, vulnerability to slashing damage, and immunity to psychic damage. A creature can also break a tendril by taking an action to make a DC 15 Strength check. A tendril takes no damage from sources other than attacks. The roper grows back any destroyed tendrils after a long rest.

Multiattack. The roper makes up to four tendril attacks then uses Reel then attacks with its bite.

Tendril. Melee Weapon Attack: +7 to hit, reach 50 ft., one target. Hit: The target is grappled (escape DC 15). Until this grapple ends the target is restrained and the roper can't use this tendril on another target.

Reel. The roper pulls each creature it is grappling up to 25 feet straight towards it.

Bite. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) piercing damage plus 9 (2d8) acid damage.