After a long journey: ringing both the east and west bells; collecting the red, green and blue keys to the seal; fighting the Heir once and losing, traveling the land as a ghost, collecting the crystal halo to teleport dash, collecting the soul items left behind at the hero's shrines, you are finally ready

The heir stood in the middle of the arena in her ghostly form, looking down at you as you approached her, causing her to summon a large spectral sword from above, grabbing its handle as it descends. right then, she gave you a somber look, one of pity? resignation? then, she spoke

Heir: "are you prepared, seeker of ruin?"