Celestial Boon: Armor of the Divine Warrior

Very rare boon 

You have been granted the radiant armor of an angelic spirit.

• You can conjure this armor as a bonus action, gaining temporary hit points equal to 2 times your level.
• While these hit points remain, you have advantage on saving throws against damaging spells and effects, and attack rolls made against you have disadvantage.

Once you have used this ability you can’t use it again until you finish a long rest.