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For the chapter, see Sectumsempra (chapter).

Introduction

Sectumsempra is curse invented by the Half-Blood Prince. It acts like an invisible sword, slashing the victim with deep wounds, causing them to bleed heavily.

From the Story

Harry Potter and the Half-Blood Prince

Discovered in chapter 24, Sectumsempra

The curse is written in Harry's copy of Advanced Potion Making by its previous owner, the Half-Blood Prince. The wounds are not immediately fatal to the victim, although they are at risk of dying from the heavy blood loss. A counter-curse exists to the spell, a song-like incantation, which Professor Snape uses on Draco Malfoy after Harry uses Sectumsempra during their duel, and dittany can be used to prevent any scarring.

Discovered in chapter 26, The Cave

Sectumsempra will not work on Inferi; although gashes appear in their sodden rags and icy skin, as they have no blood to spill they are unharmed.

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