Xifrill

Calm of the Moon. When a xifrill rubs against a willing distressed creature, it will cast Calm Emotions at will.

Moon Dust. When a xifrill's HP is reduced to 0, it will explode in a puff of moon dust. Any allied creature within 10ft of the xifrill's death will be healed for 6d8 points. If the xifrill was attuned as a familiar, it will reform next to it's master within d10 weeks during a full moon. If the xifrill was killed by it's master intentionally for the healing, it will unattune itself from them and return to the celestial world or roam the wilds on its own.

Spellcasting. The Xifrill is a 5th-level spellcaster. Its spellcasting ability is Wisdom(spell save DC 14, +6 to hit with spell attacks). The Xifrill has following cleric spells prepared:
Cantrips (at will): Calm Emotions, Frostbite, Minor Illusion, Guidance

1st level (4 slots): Cure Wounds, Protection From Evil, Purify Water

2nd level (3 slots): Prayer of Healing, Spiritual Weapon

3rd level (2 slots): Life Transference

Star Bolt. As a ranged spell attack, a xifrill can spit out a bolt of radiant light at an enemy.

Star Bolt Ranged Attack. Ranged spell Attack: +6 to hit, range 30/60 ft., one target. Hit: 5 (1d6 + 3) radiant damage.

Moonblast (Costs 1 Action). Under the light of the full moon, a xifrill will fly up and imbue itself in the light, using its wings to match its shape. The moonlight is absorbed into the xifrill and is blasted towards an enemy. The blast is centred on a target creature and explodes in a 30ft radius. The enemy creatures within radius must make a DC 16 Dexterity save or take 10d8 radiant damage and are now stunned. Creature takes half damage and aren't stunned on a successful save.