Complex sentence: Inside the Throne of Want, after the Throne Watcher and Defender are defeated, Nashandra herself will appear as the final boss of the game, and attack the player with curses and dark magic.
Split into simpler sentences: Inside the Throne of Want, the player must first fight and defeat the Throne Watcher and the Throne Defender. Once they are defeated, Nashandra herself will appear as the final boss of the game, and attack the player with curses and dark magic.