Carae'adicus

Multi-legged Agility. The Carae'adicus can move on any solid surface, including walls and ceilings, without needing to make ability checks. It can attack while climbing. 

Alert. The Carae'adicus cannot be surprised, and creatures do not gain advantage on attack rolls against it while unseen. 

Regeneration. At the start of each of its turns, the Carae'adicus regains 20 hit points, unless it has been hit with thunder, or lightning since the end of its last turn. It can regenerate from 0 hit points with this ability, but dropping to 0 hit points halts its regeneration for one minute.  

Multiattack. The Carae'adicus makes four attacks: 2 claw attacks and 2 eye attacks.

Claw Attack. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 14 (2d8 + 5) slashing damage. Creatures making concentration saving throws as a result of being hit by the Carae'adicus' claws do so with disadvantage. 

Eye attack. Ranged Weapon Attack: +8 to hit, range 60 ft., one target. Hit:   (2d8) necrotic damage. The target must succeed on a DC 16 Constitution saving throw or be poisoned for 1 minute. The poisoned target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. 

Toxic Grasp (recharge 5-6). The Carae'adicus targets up to 8 creatures it can see within 15 feet. The target must succeed on a DC 17 Constitution saving throw or take 36 (8d8) acid damage (half as much on a success) and be poisoned for one minute (not poisoned, on a successful save). The poisoned target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. As part of this action the Carae'adicus may also force any poisoned creatures within range to make a Strength saving throw, grappling them on a failed save. 

Anticipate. When a Carae'adicus the creature can see attacks it with a melee attack, it can use its reaction to impose disadvantage on the attack roll.