Hogwarts schooling

A Patronus Charm is a special bit of magic that requires a wizard to envision one of their happiest memories while casting the spell. The feeling of happiness must be genuine or strong enough to produce a radiant, ethereal beast, the embodiment of that wizard's positive emotions that serves as their protector. When you cast this spell, you can choose to conjure an incorporeal or corporeal patronus. If you attempt to cast this spell while frightened or within 60 feet of a dementor, you must make an ability check using your spellcasting ability. The DC equals 10 + the number of dementors within 60 feet of you. A roll of 19-20 on the die automatically succeeds. On a success, you cast the spell. On a failure, you can only conjure an incorporeal patronus, but if you fail the check by 5 or more, the spell fails entirely.