I had been searching for the horns for many hours when I decided to ask other people for help. I was informed that the top 2 chests needed to be done first in order to unlock the bottom one. However unfortunately I did not follow that order. Newer players who have joined the game are not informed about the order in which they need to be unlocked. Is there any way to inform newer players about this, so that they are able to continue the storyline?