Elemental Mastery

The elements are at your disposal and you can make them surpass their usual capabilities with the following benefits:

• Whenever you cast a spell that deals Cold, Fire, Lightning, Thunder, Poison, Acid, Psychic, Radiant, Necrotic or Force; you can swap that spell's elemental damage type with another from the listed types.
• Whenever you deal any kind of damage (except for Piercing, Slashing and Bludgeoning) from a spell, the damage ignores resistance and treats immunity as resistance.
• When you deal damage of an element the target of your spells is vulnerable to, you deal additional damage equal to your spellcaster level multiplied by your spellcasting ability modifier (for example, a level 20 Wizard times a +5 Intelligence Modifier = 100 additional damage). This additional damage cannot be lessed in any way.