Sibling Discord

"In halls of dusk where echoes wane. A figure roams, its will to reign. With ancient thirst and eyes that gleam. What creature dwells within this dream?" Adam read aloud, frowning at the easy riddle. 'An ancient creature roaming in the night. Didn't we fight a bunch in the canyon?' He pondered, remembering their red glowing eyes, nightmarish abilities, and terrifying whispers.

"An evil ghost!" He exclaimed, sure about his answer.

However, the text remained unmoving, showing the wrongness of the response.

"How is it incorrect? I've seen and fought them myself!" He yelled, punching at the illusory Elven symbols in frustration. Then, he enumerated their names, believing the answer must be more specific, "Pontianak, Poltergeists, Haunted soul, Shadow Ghost, Vengeful Spirit, Doppelgänger, Dullahan!" Alas, no reaction manifested, causing his ethereal frame to tremble as he bit his lips.