Cantrip master

Instead of blasting your enemies with one big burst of damage, you practiced small spells that you use to chip away at your opponents without expending any spell slots. You gain the following benefits 

• you learn four cantrips of your choice from your classes spell list (if you are multi classing with two classes that use cantrips you can choose from both classes spell lists to get your four spells. The spell casting ability for these spells depends on the ability of the class you took the spell from) 
• When you cast a cantrip, you can use your bonus action to cast another cantrip.
• when you cast a cantrip that deals damage, you can choose to expend a spell slot in order to increase the number of damage dice rolled by a number equal to the level of the spell slot expended