Armour of Moonbasking

Armour of Moonbasking is a very rare Light Armour that bestows Temporary Hit Points and Armour Class to its wielder when they Wild Shape.

This armour was designed by lunar-obsessed Cuthbertina, a gnomish arcane smith who now lives peacefully on a mountain plateau with her magical forge.

Properties

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The wearer of this item gains:

Lunar Bestial Vitality: You gain 22 temporary hit points after casting Wild Shape. While those temporary hit points are active reduce all incoming damage by 1.

Lunar Bestial Fortitude: You have a +2 bonus to Armour Class. You also have Advantage on Saving throws against spells. This effect persists while using your druidic Wild Shape ability.

This armour is largely intended for a Circle of the Moon and Circle of the Stars druids. It is one of three light armours designed for specific druid subclasses, the others being Armour of Landfall for Circle of the Land and Armour of the Sporekeeper for Circle of Spores.
Circle of the Stars  Starry Form counts as  Wild Shape for the purposes of this item. In addition, switching Starry Forms resets the 22 temporary hit points granted by Lunar Bestial Vitality. This can be done once per turn for free at level 10 with  Twinkling Constellations.
Speaking to a party member in  Wild Shape and then ending the conversation briefly undoes the transformation, thus causing the temporary hit points to be refreshed.

 Lunar Protection incorrectly states it provides a +1d4 bonus to Armour Class; it is a flat +2 bonus.
Lunar Protection persists on the character after unequipping Armour of Moonbasking while affected by Starry Form.
When affected by a Starry Form, the bonus AC is applied a second time, resulting in a total AC bonus of 4.