What do you use the bone dust for in adventure quest worlds

You use it to get to Tercessuinotlim. Tercessuinotlim is Miltoniussecret. You go to Citadel. You go to the cave at the right. Go in the middle cave. Go back. Then you go to the right cave. Then you go to the cave there. Then you see a portal to Tercessuinotlim. Lots of explaining. =) Please feel free to improve the answer.