I is for Inferius
One of the darker creations of J. K. Rowling, Inferius are dead bodies which have been reanimated by a dark wizard. Created through Necromancy, we see them for the first time when Dumbledore and Harry journey to attempt to find a Horcrux to destroy. They were used as an army by Voldemort to protect the pendant containing a section of his soul. The only thing which works against the Inferius is fire. They hate light and warmth so only a fire summoning spell would work.
They are corpses, dead bodies that have been bewitched to do a Dark wizard's bidding. Inferi have not been seen for a long time, however, not since Voldemort was last powerful.... He killed enough people to make an army of them, of course."
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