Beta Titan: Camazotz

Echolocation. Camazotz has advantage on perception saving throws that rely on hearing. He can't use its blindsight while deafened.

Wandering Darkness. Camazotz pulls all clouds to him, shrouding him from the sun, making it always dark around him.

Flyby. When Camazotz attacks a target, that creature can no longer make an opportunity attack against Camazotz.

Bat Minions. He has always four swarms of giant bats, and he can call more if necessary. He can hear through their ears as well.

Legendary Resistance (3/Day). If the titan fails a saving throw, it can choose to succeed instead.

Titan power. Camazotz's attacks count as magical in order to overcome resistances. 

Multiattack. Camazotz makes four attacks on his turn. One bite, two claw attacks and one tail attack.

Bite Attack. Melee Weapon Attack: +14 to hit, reach 15 ft., 1 target. Hit: 20 (3d10 + 5) piercing damage. 

Claw Attack. Melee Weapon Attack: +14 to attack, reach 15 ft , 1 target  Hit: 15 (2d10 + 5) piercing damage.

Tail Attack. Melee Weapon Attack: +14 to attack, reach 30 ft , 1 target  Hit: 10 (1d10 + 5) piercing damage. A target hit by this attack is automatically grappled and must use it's action to make a DC 24 strength saving throw to free itself.

Screetch (recharge 5 6). A high pitched screem comes out of Camazotz mouth, forcing all that hear it to make a DC 20 con save, or take 5d10 thunder damage and be stunned for one round. On  a successful save, one takes half the damage and isn't stunned.

Camazotz can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. Camazotz regains spent legendary actions at the start of its turn.

Call Bat Swarm (Costs 3 Actions). Summons a Swarm of Giant Bats.

Command Bat Swarm (Cost 2 Actions). Makes one Swarm of Giant Bats move and or use an action.