The tendrils could be deflected or blocked, temporarily, with the Shield Charm. Grindelwald was also seen controlling the spell as an offensive weapon by causing tendrils of black fire to extend from the ring and burn his enemies, mainly Aurors. Krall, who expressed doubts about Grindelwald's goals and methods earlier and thus showed an insufficient amount of loyalty towards Grindelwald, was burnt to ash within a few moments of entering the fire. It was possible to walk through the flames unharmed, as demonstrated by Vinda Rosier, Credence Barebone, Queenie Goldstein and Abernathy amongst others, only if they were loyal to the caster and meant them no harm. When cast, Protego Diabolica created a protective ring of black fire around the caster. Casting and effectsĪs a true follower, Vinda safely crossing the circle of flames Strout's treatments managed to save Jacob's life, and a recovering Jacob told their sibling from his hospital bed that he had indeed found Dai Ryusaki's Dark Scroll in a cave in Japan, and that Protego Diabolica sprung a trap around it when he tried to reach it. Jacob's sibling then told Healer Miriam Strout about this at St Mungo's, and she went to adjust Jacob's treatments accordingly, telling them that their brother would be healed soon, and that she was surprised he had survived such a spell, assuming Jacob must have used the Shield Charm at the right time.

ĭuring the 1990–1991 school year, Professor Albus Dumbledore came to conclude that Jacob's life-threatening burns that he was being treated for at St Mungo's was Protego Diabolica, and informed Jacob's sibling about it. Several victims who never attempted to cross either escaped the ring or fell to its wrath. Krall, who considered turning against Grindelwald, failed to enter. Because they were loyal, Vinda Rosier, Queenie Goldstein, Abernathy, and Credence Barebone all passed through the fire into the circle. In 1927, Gellert Grindelwald cast this spell in the Lestrange Mausoleum to test the loyalty of his followers and kill a number of his enemies, most of whom were Aurors trying to arrest him.

Grindelwald controlling the fire to separate his enemies from his allies

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