Welcome to Harry Potter Theory. Today we're diving in to a theory addressing the REAL reasoning for Snape's motivation to create his signature dark curse: Sectumsempra.-

While a student at Hogwarts, Severus Snape scribbled all sorts of spells and curses in to his Advanced Potion Making textbook under the moniker the 'Half-Blood Prince'.

And when Harry first takes Slughorn's potions class, he's fortunate enough to find the very same textbook that a young, troubled Snape once jotted pure gold in to.

"This book is the property of the Half Blood Prince"

And Harry ends up using the book for quite some time, as for each and every one of Slughorn's lessons, the book provided easier and clearer instructions that he could follow. The book was like having cheat codes to all of the potions lessons. But the book didn't just contain advice on how to make potions or perfect existing spells, there were also spells written inside that were totally new to Harry...Spells he hadn't heard of before. Because you see, these were spells that Snape had created HIMSELF.-

One such spell was Sectumsempra.

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