Evoker's Exchange

Alter: While wearing this amulet, you can choose to convert the damage from one form of raw energy to another. You can use this amulet as a spellcasting focus when you cast a spell of 1st level or higher that deals fire or lightning damage and doesn't require concentration. When you do, you can choose to have the spell deal lightning damage if it originally dealt fire, or vice versa. 

If a spell that deal fire damage would normally ignite flammable objects that aren't being worn or carried, it does not if its converted to lightning damage in this way, although lightning damage converted to fire does ignite such objects.

Attunement: No
Rarity: Uncommon
Type: Amulet
Cost: 315gp