Ap Lyw'sh

Eldritch Bond. Created by the patron of a warlock, the ap lyw'sh is able to telepathically communicate with its master.

Bite. +4 to hit, 1d4+2 piercing damage and 1d4+2 necrotic damage

Blood Siphon. +4 to hit, 1d8 + Player CON necrotic

While within 30ft of its master, the ap lyw'sh can use the characters bonus action to target an enemy and siphon the life-force from the target to heal its master. The damage dealt is the amount healed. This ability scales as the player levels, the healing benefit increasing by 1 dice size each time the player gets to choose a stat-score increase or feat on a level up. This ability can only be used a number of times equal to the player's proficiency modifier per long rest.

Evaporate. If the ap lyw'sh's HP hits 0, it can make a DC 16 CON save. On a success, it will instead regain 1 HP. On a fail, the creature is enveloped in a puff of black smoke and disappears, returning to the entity that created it.