Also known as Liquid Luck. This is a magical potion. Felix Felicis makes the drinker lucky for a period of time, depending on how much is taken, during which everything they attempt will be successful. It's meant to be used sparingly, however, as it causes giddiness, recklessness, and dangerous overconfidence if taken in excess. Felix is highly toxic in large quantities and is also a banned substance in all organised competitions, such as Quidditch, along with all other methods of cheating. It is very difficult to make, disastrous to get wrong, and requires six months to stew before it's ready to be consumed.