Orb of purity - horn fix – Amaranthine Voyage: The Orb of Purity (Full) Review

Unfortunately I also ran into that glitch. The fix: uninstall/reinstall and whatever you do DO NOT touch the horn until AFTER you have touched the area (right of the big crystal in the resonance room) where the horn goes. Only AFTER you have touched it and gotten the close up showing the missing horn THEN go get the horn and bring it back. Otherwise you can't finish the game. Lame but true.
Review by Dracyy on Amaranthine Voyage: The Orb of Purity (Full).