Spell expertise

You have trained and honed your skills with the spells you use most frequently, granting you these benefits:

• Increase your spellcasting modifier by 1, to a maximum of 20.
• You have an advantage with the spell of your choice.
• With the expertise to the spell, you gain additional damage die 1 lower than what it is. (Example: normal damage is 1d8, feat is 1d6. 2d6 = 2d4.)