sentences:  The duplicitous Feng then explains his true identity and purpose, and that the monolith is composed of a magnetic stone which exerted a force of attraction upon Conan's metal armor.Taking the letter of treaty from Conan, Feng begins to play musical notes on a flute.Responding to the strange piping, a monster in the form of a giant amoeba begins to slither down from the top of the shaft toward Conan.