Flight of Moonsilver Angel

The angel's weapon attacks are magical. When the angel hits with any weapon, the weapon deals an extra 4d8 Radiant damage (included in the attack).

The angel has advantage on saving throws against spells and other magical effects.

An angel of the Flight of Moonsilver wields a spear made from a shard of the Helvault. Hit points lost to this weapon's damage can be regained only through a short or long rest, rather than by regeneration, magic, or any other means. Once per turn, when the angel hits a creature with an attack using this weapon, it can wound the target. At the start of each of the wounded creature's turns, it takes 1d4 Necrotic damage for each time the angel has wounded it, and it can then make a DC 15 Constitution saving throw, ending the effect of all such wounds on itself on a success. Alternatively, the wounded creature, or a creature within 5 feet of it, can use an action to make a DC 15 Wisdom (Medicine) check, ending the effect of such wounds on it on a success.

The angel makes two melee attacks.

Melee Weapon Attack +8 to hit, reach 5 ft., one target. 7 (1d6 + 4) Bludgeoning damage plus 18 (4d8) Radiant damage.

The angel touches another creature. The target magically regains 20 (4d8 + 2) hit points and is freed from any curse, disease, poison, blindness, or deafness.

The angel magically polymorphs into a humanoid or beast that has a challenge rating equal to or less than its own, or back into its true form. It reverts to its true form if it dies. Any equipment it is wearing or carrying is absorbed or borne by the new form (the angel's choice).
In a new form, the angel retains its game statistics and ability to speak, but its AC, movement modes, Strength, Dexterity, and special senses are replaced by those of the new form, and it gains any statistics and capabilities (except class features, legendary actions, and lair actions) that the new form has but that it lacks.