The Infernal Robe is a very rare piece of clothing that uses your Charisma modifier to increase your cantrips' damage as well as give you temporary hit points.
Presumably Mizora was not always a sensuous and manipulative benefactor of troubled souls like Wyll. Negotiating the hierarchies of hell result in changes of form - but was she ever less beautiful, less erudite, less willful?
Properties
10
Armour Class + Dexterity modifier
Clothing 
Rarity: Very Rare
Weight: 1.8 kg / 3.6 lb
Price: 1,600 gp
Special
The wearer of this item gains:
- Fire Shield: Warm
- Armour Class +1
- Grants Resistance to Fire damage.