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| Spells | What they Do? |
| Deletrius | Erases the effects of the Prior Incantato spell, can perhaps erase other illusory effects as well. |
| Densaugeo | A spell which causes the target's teeth to grow. |
| Diffindo | The severing charm, cuts an object, generally a strap or cord or other thin tense material. |
| Disillusionment | A spell used to make something not invisible, but very hard to see as it mimics the view behind it. |
| Dissendium | Used to open the secret passageway out of Hogwarts which leads to the cellar of Honeydukes in Hogsmeade, might be a general 'Open Sesame' for secret doors. |
| Engorgio | The enlargement charm, used to make an object increase in size. |
| Enervate | Used to wake up someone who has been stunned, can likely be used to rouse any unconscious person. |
| Expecto Patronum | The Patronus charm, used to conjure a silvery animal form which is the embodiment of the caster's positive feelings. A Patronus is usually used to repel a Dementor. |
| Expelliarmus | The disarming charm, used to make an opponent's weapon fly from their hand. |
| Ferula | Conjures a wooden rod. |
| Fidelius | The fidelity charm, used to entrust a secret to one person, thus making the information unknowable to anyone but the designated Secret Keeper. |
| Finite Incantatem | Terminates a previously cast charm. |
| Furnunculus | Causes the target to break out in boils. |
