Chittering Horror

Corrupt Ichor: The ground within 5 feet of the chittering horror is lightly obscured and slick with acidic filth. A creature that enters this area for the first time on a turn or starts its turn there takes 3 (1d6) acid damage.

Skittering Menace: The chittering horror can take the Disengage or Hide action as a bonus action on each of its turns.

Chittering Presence: At the start of each creature’s turn within 10 feet of the horror, that creature must succeed on a DC 12 Wisdom saving throw or have disadvantage on its next attack roll before the end of the turn as maddening chittering and wet clicking gnaws at its sanity.

Multiattack: The chittering horror makes two attacks: one with its claws and one with its scorpion tail.

Claws: Melee Weapon Attack: +5 to hit, reach 5 ft., 1 target. Hit: 8 (1d8 + 3) slashing damage plus 3 (1d6) acid damage

Scorpion Tail: Melee Weapon Attack: +5 to hit, reach 10 ft., one target.
Hit: 7 (1d8 + 3) piercing damage plus 7 (2d6) poison damage and 7 (2d6) necrotic damage.
The target must succeed on a DC 13 Constitution saving throw or be poisoned until the end of its next turn.
If the save fails by 5 or more, the target is also frightened of the chittering horror until the end of its next turn as necrotic venom seeps into its mind.

Scuttle and Strike (Recharge 5–6): The chittering horror moves up to half its speed without provoking opportunity attacks and makes one Scorpion Tail attack.

Violent Twitch: When a creature misses the chittering horror with a melee attack, the horror can make one Claws attack against that creature.

Chattering Call: at 30 hp the creature lets out a cry and calls for (1d4 - 1) Grotesque Scuttlers.