mask of hevnoraak has just disappeared from my inv, and chests. any ideas how to retrieve it cos ive got all rest to get konahrik?????????

Hope you can find it, there is only one of those in the game.

Does it appear on an earlier save? Are you sure about where you are looking for it? I had carried a mask off and put it in one of my other houses by mistake.

If you are on the PC, you can spawn the mask, if you are on the console, then you need to find the mask, or the save that still has the mask where you can find it.

Did you accidentally drop it instead of storing it? I did that with another one of the masks and then decided that I would just leave it there and put it where I wanted it when I came back home after doing something else... when I went back and the cell reloaded, the thing was just... gone.