Soulbound Companion

The following numbers increase by 1 when your proficiency bonus increases by 1: the companion's skill and saving throw bonuses (above) and the bonuses to hit and damage of its Spectral Touch attack, and the number of hit points restored by its Spirit Heal action (below)

The companion can see 60ft. into the Ethereal Plane when it is on the Material Plane, and vice versa.

The companion cannot be turned, such as by a cleric's channel Channel Divinity class feature or similar ability.

Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 6 (1d8 + 2) necrotic damage.

The companion 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.

The magical tether the companion shares with you from the beyond restores 2d8 + 2 hit points to itself.

When a creature within 5 feet of the companion takes damage, the companion can magically take that damage, instead of the creature taking it. This feature doesn't transfer any other effects that might accompany the damage, and this damage cannot be reduced in any way.