Chubtub

Ethereal Sight. Chubtub can see 70 feet into the Ethereal Plane when it is on the Material Plane, and vice versa.

Improved Incorporeal Movement. Chubtub can move through other creatures and objects as if they were difficult terrain.

Nine Lives. When Chubtub dies he is sent to the first layer of hell and with each consecutive death he's sent to the next layer. If Chubtub dies a ninth time, then his soul is claimed by Asmodeus himself.

Multi Attack. Chubtub makes two claw attacks.

Claws. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 3 (1d4 + 3) slashing damage. 

Fire Breath. RangedWeapon Attack: +3 to hit, range 15/25 ft., one target. Hit: 5 (1d6 + 5) fire damage.

Etherealness. Chubtub 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.

Feline charm. Chubtub attempts to charm a creature of its choosing it can see within 30 feet of it. The chosen creature must make a DC 14 Wisdom saving throw or be charmed until the end of Chubtub's next turn.