Creature Sense:
Zero is aware of the presence of creatures within 1 mile of it that have an intelligence score of 4 or higher. It knows the distance and direction to each creature, as well as each creature's Intelligence score, but can't sense anything else about it. A creature protected by a mind blank spell, a nondetection spell, or similar magic can't be perceived in this manner.

Blessing of the Pumpkin King:
When Zero reduces an enemy to 0 hit points, Zero gains 5 temporary hit points

Shadow Blend:
While in dim light or darkness, Zero can use a bonus action to become invisible. The invisibility lasts until Zero uses a bonus action to end it or until the demon attacks, is in bright light, or is incapacitated.

Ethereal Sight. Zero can see 60ft. into the Ethereal Plane when it's on
the Mortal Plane, and vice versa.

Incorporeal Movement. Zero can move through other creatures and objects
as if it were difficult terrain. It takes 5 (1d10) force Damage if it
ends its turn inside an object.

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

Multiattack: Zero makes two bite attacks and one bark attack per action

Bite. Melee Weapon Attack: +7 to hit, reach 5 ft, 1 target, Hit: 15 (2d10 + 4) piercing Damage.

Withering Bite. Melee Weapon Attack: +7 to hit, reach 5 ft, 1 target, Hit: 15 (2d10 + 4) necrotic Damage.

Bark. Ranged Weapon Attack. +7 to hit, reach 5ft, 1 target, Hit: 11 (2d6 + 4) thunder Damage.

Multiattack: Zero makes two bite attacks and one bark attack per action

Bite. Melee Weapon Attack: +7 to hit, reach 5 ft, 1 target, Hit: 15 (2d10 + 4) piercing Damage.

Withering Bite. Melee Weapon Attack: +7 to hit, reach 5 ft, 1 target, Hit: 15 (2d10 + 4) necrotic Damage.

Bark. Ranged Weapon Attack. +7 to hit, reach 5ft, 1 target, Hit: 11 (2d6 + 4) thunder Damage.

Bark. Ranged Weapon Attack. +7 to hit, reach 5ft, 1 target, Hit: 11 (2d6 + 4) thunder Damage.