What is the only spell to repel a lethifold?

The only known spell to repel a lethifold is the Patronus Charm. This spell produces a silvery, animal guardian that can drive away dark creatures, including lethifolds. The Patronus Charm requires a strong and pure positive emotion, such as happiness, hope, or love, to cast successfully. It is a difficult and advanced spell to master, but it is highly effective against lethifolds due to their dark, malevolent nature. The spell creates a powerful barrier between the caster and the lethifold, pushing it away and protecting the caster from being consumed. Due to the rare and dangerous nature of lethifolds, it is crucial for witches and wizards to be proficient in casting the Patronus Charm in case they ever encounter one.