Hat of Wizardry

You can use the hat as a spellcasting focus for
your wizard spells.
You can try to cast a cantrip that you don't know.
The cantrip must be on the wizard spell list, and
you must make a DC 10 Intelligence (Arcana)
check. If the check succeeds, you cast the spell.
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.