Elemental Master(Lightning)

Your understanding of the elements has opened your mind to a understanding of the elements beyond normal means gaining the following benefits:

• Spells you cast ignore the immunity to damage of the chosen type. In addition when you roll damage for a spell that causes damage of that type, you can roll 1 addition damage dice when determining the total damage done.
• You may choose this feat multiple times. You must have the corresponding Elemental Adept feat of the damage type chosen in order to have elemental Mastery of the chosen type.