Cloak of Amon

Wondrous Item This exquisite cape is made from red leather with shining brass clasps. It generates a great sense of greed and envy in those that view it.
It attaches easily to any armour and billows slightly whenever the wearer moves or speaks.
While wearing the cape you can activate one of the following effects, after using this effect the wearer must perform a short or long rest to recharge

Daemonic Weapon. As an action, you can imbue one weapon that you are holding with daemonic energy. For 1 minute, you add your Charisma modifier to damage rolls made with that weapon (with a minimum bonus of +1). You gain a number of temporary hit points equal to the damage caused by that weapon's damage roll. If the weapon is not already magical, it becomes magical for the duration.
You can end this effect on your turn as part of any other action. If you are no longer holding or carrying this weapon, or if you fall unconscious, this effect ends.

Daemonic Form. As an action, you can change into your daemonic form, sprouting horns and long sharp claws, merging your armour with your flesh and your face warping into a fanged maw or other similar effects, lasting for 1 hour.
Whilst in your daemonic form any armour you are wearing is unable to be removed and you have advantage on rolls against being charmed, frightened and poisoned. You gain resistance to necrotic damage but become vulnerable to radiant damage and your melee attacks treat immunity as resistance. Rare