@JeremyECrawford PHB 201 says: "A cantrip is a spell that CAN be cast […] without a spell slot".
Can you voluntarily spend a spell slot on a cantrip? (For instance, to protect it from Counterspell?)
Obviously, there would be no other benefits / damage bonuses.
Thank you! <3
— fek (@fekfekfekfek) October 10, 2018
A cantrip never uses a spell slot. #DnD https://t.co/RiI6gxWIto
— Jeremy Crawford (@JeremyECrawford) October 10, 2018