Apex

Apex Eyes. The Apex have two floating eyeball familiars through which it can see and scout. These eyes move independently from the Apex and can scout as far away as 1,000 ft. from their master, constantly feeding whatever they're seeing back to it. The Apex always knows the exact location of its eye familiars. If an eye were to be destroyed, the Apex can create a new eye after 24 hours.

Perfect Senses. The Apex has advantage on Wisdom (Perception) checks that rely on hearing or smell. It can also reliably track anything it knows the scent of from up to 1,000 ft..

Beastly Reflexes. As long as the Apex can move freely, it gains a +5 bonus to its Armor Class.

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

Multiattack. The Apex can make three attacks. Two with its claws and one with its bite.

Claw. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 17 (2d6 + 10) slashing damage.

Bite. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 21 (2d10 + 10) piercing damage.

Acid Spit. Ranged Weapon Attack: +10 to hit, reach 60 ft, one target. Hit: 24 (3d8 + 10) acid damage.

Acid Breath (Recharge 3). The Apex exhales fire in a 30-foot cone. Each creature in that area must make a DC 17 Dexterity saving throw, taking 71 (13d10) acid damage on a failed save, or half as much damage on a successful one.

Dash. The Apex may take the Dash action as a bonus action.

Opportunity Attack. When the Apex makes an opportunity attack it can attack twice with its claws.

The Apex 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. The Apex regains spent legendary actions at the start of its turn.

Detect. The Apex makes a Wisdom (Perception) check.

Bite. The Apex makes a bite attack.

Movement. The Apex moves up to its movement speed.