THE REALM OF TERRA
Go to the Ebony Mill in Caldera. Upon entering the Realm of Terra through the dimension door, walk across the rope bridge. If you go left you won't go far, unless you can jump high enough - levitation is not possible here. It's a better idea to go up the stairs. To your left you can see a passage, but it's closed off by a grating, so you can only go right.
You'll see a stone wall that looks somewhat like an entrance gate, but it's obviously closed. On the left side of it is a heavy metal ring: pull it. You'll hear a sound of a mechanism, but the stone wall remains closed. Walk back towards the stairs, and you'll see that the grating has disappeared. So you can go into that passage, which brings you to a large cave. A path leads across a chasm to a wall with four of the same heavy metal rings. If you pull the wrong one, you'll bring out a pair of axes swinging across the path you just walked on; you can time it right and avoid them, but it's better to pull the second ring from the left. This produces the sound of a heavy mechanism, and when you walk back to the stone wall, you'll see that the gate has opened.
You enter a large hall with a heavy-looking door at the far end. Of course you have to open it somehow, and the four pedestals beside it are the locks - you need to find the keys to place in them. To the left is a cave which has a candle-lit picture on the wall, with engraved words around it. They correspond to the pedestals: Frigidum, Humidum, Siccum, and Calidum. When you look at the picture, you'll see that each of those words is associated with two Elements, for instance Humidum with Aer and Aqua.
When you go back to the main hall and look around, you may notice the large rocks standing in a neat row on each side. Each rock has a name tag such as Aqua Aer - which together make up Humidum. Touch it, and a Storm Atronach will appear. After you kill it, its inventory will show a strange object: a Tear of Humidum! Put it in the appropriate pedestal, and hey presto, it's unlocked! Repeat this for the other three, and the large door will open.
I took some time to explain this, but it's easier to just forget about the names and kill all the Atronachs that will appear - after all, you'll only have to deal with them one at a time.
When you enter the cave beyond, you'll pass a tapestry hanging from the ceiling with the words "Sigh of Death", and this is a warning, because there's a big cloud in the middle of the cave, and it's poisonous! Hurry across and to the left, there's a helmeted skull mounted on a pole, called Sigh of Terra. Hit it and the cloud vanishes.
Up on the edifice you can see someone in black armor. Get up there (you can levitate in this place) and talk to him. His name is Terra, the Demon of the Element of the same name, and he wants to fight! So oblige him and finish him off. He'll blast you with nasty spells first (mainly poison), and then use his Daedric Battle Axe on you.
The moment he dies you get a message saying that "death is at hand", and a countdown starts. So don't stand about to rummage in Terra's inventory, what are you waiting for? GO! Jump off, levitate away, whatever; just get out of the way of the ensuing explosion. After that you'll have plenty of time to take Terra's belongings and the pearl of Corrupted Terra. His axe is very useful, if you can handle it. Return to where you entered the Realm, and go back through the dimension door; you'll find yourself inside the Ebony Mill again.
Now it's time (if you haven't already done it) to
Or go to another mill to enter
- the Realm of Aqua
- the Realm of Ignis
- the Realm of Aer
If finding the pearl of Corrupted Terra completes your collection, you can go to the cave and The Pit below the Black Mill to meet Tommy.