Astral Glide. As a bonus action, the Astrailie "glides" into the ethereal plane. The Astrailie stays in the ethereal plane for however long it wants and can return to the material plane as a bonus action. An Astrailie will go into the Ethereal plane once it gets to 20 hp and runs away.
Passive Concentration. Astrailie have advantage on concentration checks.
Multiattack. Two Claws attacks and one Bite attack.
Or
Single attack. One Celestial Darts attack.
Claws. Melee Weapon Attack: +10 to hit, reach 5ft., 1 target. Hit: 37 (5d12 + 12) Piercing & Radiant damage.
Bite. Unarmed Strike: +10 to hit, reach 5ft., 1 target. Hit 24 (4d6 + 12) Peircing & Radiant damage.
Celestial Darts. Ranged Weapon Attack: +10 to hit, range 20/120 ft., 5 targets. Hit: 42 (6d12 + 12) Radiant damage.
Ethereal Relations. Astrailies can turn themselves ethereal to avoid damage from one attack. The become material after the one attack is done.
Attack of Opportunity. Can make one bite attack or two claw attacks.
The Astrailie can do 3 actions between others turns.
Banishment (Costs 3 Actions). They can banish one creature of their choice. The creature must succeed on a DC 24 CHA save or be banished to the Ethereal Plane for 1 hour. The Astrailie must keep concentration or else they will reappear.
Charming Eyes (Costs 2 Actions). The Astrailie starts at a creature with its mystical eyes to invoke disadvantage on whatever they do on their next turn.
Blinding Light (Costs 1 Action). The Astrailie creates a bright light from its foggy tail. Any creature within 30ft must succeed on a DC 24 CON Save or become blinded for their next turn.
Description
Astrailie are mostly considered to be wayward guides sent by gods. They can come in many forms but the most common is a cat and a soft bell is heard when they appear. Astrailie should not always be trusted because you cannot tell what god they belong to and could lead you to do things that would be against your faith.
Astrailie aren't always connected to gods and many are also considered to be guides of fate. Showing up and leading you onto a new pathway or helping you find your way through a situation. They appear in many places but the most common are secluded.
Astrailie are peaceful creatures that prefer to watch from a distance and act as guides when they feel it's needed. When attacked though, they are very dangerous creatures and for the few that have survived a fight with an Astrailie, they say they cannot be killed.