Verified answer

It only works in hell difficulty on closed battle.net. It doesn't work on single player off-line or on open battle.net.

It's one of the 3 three keys that you need to open up a portal to start the Pandemonium Event. You also need the Key of Hate from the Summoner, the Key of Destruction from Nihlathak.

It's a good idea to have 3 sets of each key before you start the Pandemonium Event. Once you have the 3 sets of keys, go back to Harrogoth, put the 3 keys in the Cube, and transmute them. A red portal will open up to 1 of 3 stages randomly, so that's why it's a good idea to have 3 sets of keys because if you use it in 1 game, it'll open up all 3 portals. Also try to open the portal far away from each other so you don't enter a portal accidentally or block entrance to another portal. You'll take on Lilith (uber version of Andariel), Uber Duriel, and Uber Izual. Lilith drops Diablo's Horn, Uber Duriel drops Baal's eye, and Izual drops Meph's Brain.

Once you get the 3 organs, put them in the cube and transmute again. You'll open a portal to another world where you take on all 3 uber bosses (Meph, Diablo, and Baal). Defeat all 3, and you'll get a Hellfire Torch, which has some really nice bonuses:

+10-20 To All Attributes

All Resistances +10-20

+3 to random character class skills

25% Chance To Cast level 10 Firestorm On Striking

Level 30 Hydra (10 charges)

+8 to light radius

RE:

The Key of Terror in Diablo II?

anyone ever seen this thing before or know what it's good for? got it in the Hell level.

Key Of Destruction

The Key of terror, hate and destruction are all found by the following mini bosses: The countess (hell), The Summoner (hell), and Nihlathak (hell), in that order. Get all three keys, fuse them in the cube, go in the portal (must happen in hell act 5), kill the uber mini boss, get an organ. Get all three organs, Fuse them in the cube while in act 5 hell, and a portal to uber tristram opens up. go inside and defeat uber diablo, uber baal and uber mephisto and the last one you defeat gives you a hellfire torch (unidentified Medium charm). It isn't easy though so don't expect to kill the Ubers without an extremely strong character like a smiter paladin. And there ya go.

There are three keys which make a portal to kill one of the guys (forgot their names) and they give you a organ piece, when you get all three pieces you combine to make uber trist.

If you're playing single player it does nothing. In other realms, see here: http://forums.diii.net/showthread.php?t=372426

uumm i dunno , sorry :(