Key of Terror?

[Molieus]

Greetings, I am new to this forum but have been looking around for a while. I have been playing Diablo II quite a lot and have recently found a "Key of Terror" with my Lvl 73 necromancer. The countess in Act 1 Hell dropped it. It seems to be a quest item as it cannot be sold.
If anyone knows what this item is I would very much appreciate being told.
Cheers.

[thegiantturtle]

If you're in single player, it does nothing. If on the realms, read this (http://forums.diabloii.net/showthread.php?t=372426).

[Molieus]

Thanks very much your wisdom is greatly apreciated.