Sectumsempra

"Sectumsempra - An offensive and effect spell that causes the target to lose half of its health."

You need Restricted Section Key gamepass to open the gates to the Restricted Section in the Library on Floor 2

Location
Sectumsempra Spellbook is located in the Restricted Section in the Library on Floor 2. You need Restricted Section Key gamepass to open the gates to the Restricted Section.