Spell slinger (Sorcerer, Warlock)

You have learned techniques to make your attacks with certain kinds of spells more deadly, gaining the following benefits:

• When you cast a spell that requires you to make an attack roll, you score a critical hit on a result of a 19 or a 20.
• You learn one cantrip that requires an attack roll. Choose the cantrip that requires an attack roll from the sorcerer or warlock spell list. Your spellcasting ability for this cantrip is Charisma.
• When another creature targets you with a spell that requires an attack roll, you may use your reaction to cast a spell that requires you to make an attack roll at the same creature. This spells level can not be higher than 1.