Chaosphelion

Ethereal Sight. The chaosphelion can see 60 feet into the Ethereal Plane when it is on the Material Plane, and vice versa.

Pack Tactics. The chaosphelion has advantage on an attack roll against a creature if at least one of the chaosphelion’s allies is within 5 feet of the creature and the ally isn’t incapacitated.

Pounce. If the chaosphelion moves at least 20 feet straight toward a creature and then hits it with a claw attack on the same turn, that target must succeed on a DC 14 Strength saving throw or be knocked prone. If the target is prone, the chaosphelion can make one bite attack against it as a bonus action.

Multiattack. The chaosphelion makes two attacks: one with its bite and one with its claws.

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) necrotic damage.

Claw. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) necrotic damage.

Etherealness. The chaosphelion enters the Ethereal Plane from the Material Plane, or vice versa. It is visible on the Material Plane while it is in the Border Ethereal, and vice versa, yet it can't affect or be affected by anything on the other plane.

Portal Leap (Recharge 4 – 6). The chaosphelion teleports into swirling magic, along with any equipment it is wearing or carrying, up to 25 feet to an unoccupied space it can see.