Small Monstrosity
Armor Class 17
Hit Points 9 (2d6+2)
Speed walk +0
Challenge 1/2
Senses blindsight 30 ft. (blind beyond that radius), passive Perception 8
False Appearance. While motionless, the piercer is indistinguishable from a normal stalactite.
Pierce. Melee Weapon Attack: +2 to hit one target directly underneath the piercer. Hit: 10 (3d6) piercing damage. This attack has disadvantage against a creature that is protecting its head with a shield or similar object. If the attack misses the piercer dies.
Source: Level Up Advanced 5e Monstrous Menagerie · OGL/Open