n try to cast a cantrip that you don't know. The cantrip must be on the warlock spell list, and you must make a DC 10 Intelligence (Arcana) check. If the check succeeds, you cast the s
pell. If the check fails, so does the spell, and the action used to cast the spell is wasted. In either case, you can't use this property again until you finish a long rest.
