Shadow is a mysterious merchant in Requiem of Agony. Nothing is known about him, but he is encountered first in the Main Palace, replacing the Wizard.
Shadow makes a sudden appearance in the Inner Quarters. He attacks the player. After that point, he is replaced by the Wizard again.
Shadow is the tenth boss. He can throw shadow daggers, use his sword, throw purple holy water, and kick. Later in the fight, he can shoot beams. He has 3500 HP, and his theme is Death Ballad.
Shadow flees after his defeat.