Over the next several weeks, Harry trained with Marcus in secret, adding to his already formidable skill set. By day, he continued attending classes at Hogwarts, excelling in Charms, Defense Against the Dark Arts, and Potions with ease. His magical studies were still important, but Harry now saw them as part of a larger picture — a much deeper game of strategy and survival.
By night, the Room of Requirement became his sanctuary for training. Marcus taught him the Assassin's arts: silent movement, acrobatics, and hand-to-hand combat. Harry's mind, already sharp, adapted quickly to the physical demands. His body, honed by years of Quidditch, responded well to the intense regimen.
He learned to climb walls and leap between narrow platforms with the grace of a dancer. Marcus showed him how to vanish into the shadows, how to listen for the smallest disturbances in the air, and how to anticipate danger before it struck.
And, most importantly, he learned how to fight without a wand.
The training was grueling, but Harry excelled. His natural instincts, combined with the heightened intelligence he had inherited from the Potter line, made him an ideal candidate for the Brotherhood's teachings. Every night, he pushed himself harder, his mind and body becoming sharper than ever before. He began to understand what Marcus had meant — that magic wasn't the only power worth mastering.