Protego Diabolica

Protego Diabolica is a Defensive Spell that encircles the caster in a ring of blue fire. Anyone standing inside the ring is damaged and pushed away, while the caster receives 25% damage reduction. Protego Diabolica costs 4 Focus to cast. The ring of fire lasts for approximately 26 seconds.
It costs 35000 points, and is unlocked at Year 12.
== Description ==
"Encircles the caster in a ring of lethal blue fire that provides 25% damage resistance to the caster. Damages anyone standing inside and pushes them away."
== Location ==
Protego Diabolica is located in the Dragon's Wing, the tavern in Rollsmeade. Go inside and look for the hole in the ceiling, which can be reached by using Ascendio or flying on a broom.
== Notes and Trivia ==
* This spell was used by Gellert Grindelwald in the film "Fantastic Beasts: The Crimes of Grindelwald."
* After casting this spell, using Geminio to spawn clones inside the ring of fire will allow you to quickly regenerate some of the Focus lost. However, this only works if the Channeling upgrade has been purchased.
* Protego Diabolica makes the Egor boss fight trivially easy, as the troll will continue trying to walk into the fire while being constantly damaged and pushed back. This allows the player to stand still and freely cast spells at him without being attacked.
* This is a popular spell among many casual "midrange" players for its high cost and flashy effects. However, it is not useful for PvP against more experienced players, as the caster sacrifices mobility to remain in the circle and pays a high Focus cost for an effect that is easily avoidable in most spaces.
* The ring of fire is not blocked by obstacles in the environment, making it a potential way to deal damage through walls.
* The pushback effect can be used to block off doorways and narrow hallways.