A Cantrip is a special type of spell that’s weaker than other Spells but can be used with greater Freedom and flexibility. The title of a cantrip’s stat block says “Cantrip” instead of “Spell”, and the spell has the Cantrip trait. Casting a Cantrip doesn’t use up your spell slots; you can cast a Cantrip at will, any number of times per day. If you’re a prepared caster, you can prepare a specific number of Cantrips each day. You can’t prepare a Cantrip in a spell slot.

A Cantrip is always automatically heightened to half your level, rounded up. For a typical spellcaster, this means its rank is equal to the highest rank of spell slot you have.