Welcome to Harry Potter Theory. Today we're going to be discussing one of the most feared curses in the wizarding world- AVADA KEDAVRA- also known as the KILLING curse. Specifically, we're going to be taking a look at where it came from, who created it, why it's unforgivable, why it may be merciful, and what the very surprising function of this spell may have once been.

Let's get in to it.

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