Halo of Blades

''You walk through the palace gardens, your arm locked around handsome, slightly older gentleman who had won over your attention in the ballrom. The aroma of the finest flowers about the two of you, you find somewhere private and begin to explore each other, the taste of spiced wine on your lips and his, the scent of his cologne mixing with the smells of the garden, the full moon providing just enough light overhead to illuminate his muscular features. Suddenly, you hear the bushes rustle and crack, and a gaunt man dressed in all black comes charging out, dagger in hand and ready to strike, only for a single dagger, created from light and arcana, to shoot out from the crown on your head. The man sputters, coughs, and falls into the fountain dead. Whoever the assassin was, perhaps his employer will remember the duke can defend himself.''

The halo is a bright, pale, translucent material that sits upon the head as any normal crown would. Instead of being encrusted in gaudy gems, it has eight symmetrical blades of the same material that launch themselves at enemies, or detach and deflect blows at the user's command.

Wonderous Item, requires attunement
When attacked, the wearer may expend a number of charges, up to 3, to add that much to their AC. The wearer may also expend a charge as a bonus action to deal 1d4+2 piercing damage to a target within 20ft. The halo has eight charges, and gets 1d4+2 charges at dawn.