Golem Mastery
This dungeon has very tough monsters in
it. You will most likely need a group to be able to get through it and obtain
the book. A group of linked monsters spawns in the room that the book is in.
Also keep in mind that I may not have stopped to take a picture of every last
room. So if you are in a room in the picture, and then continue and the next
room you are in is not the next picture in the tutorial, try not to freak out.
Location 1: Thundering Steppes
Head to to the Ruins of Varsoon.
Ruins of Varsoon Loc = -670, x, 670
The entrance is a metal grate in the ground.

Location 2: Ruins of Varsoon
Once you are in Varsoon, you should be standing next to a ladder, surrounded by mushrooms, and desperate LFG people talking dirty in OOC. You may have to suck it up and actually group with some of these people in order to get to the book, but I was lucky enough to find a pretty good group.
Start off by heading forward down the caves to this large opening, head along the left wall to the opening pointed to with the white arrow in the following image:

Next you need to continue down the tunnel and you should eventually come to this opening:

Head along whatever wall looks safest, to avoid the skeletons and head through the passage at the other side of the room. Continuing along you should come to another room similar to the last one. Do the same thing here and use the walls to get past the skeletons and continue down the next tunnel:

This should lead you to a pipe, go through it:

Next you will come to a small room with some dangerous skeletons in it. To get past these, you can hug the left wall, and jump on top of the barrels to get to the door safely, and with little chance of the monsters attacking you.

Now you need to be careful of the giant Clay golem looking guys that wander the halls. Some conned double arrow red to Level 24. After a little ways you should come to a fork in the road, with the options of either Right or Left. Turn left and you should come to the Tailor Room:

Again, be very very careful of strong monsters in here. There are a bunch that wander inside the tailor room. When it is safe, continue inside, turning to your left to head to the back corner of the room. Back there you should see a ramp heading up:

Head up this ramp carefully. There are a bunch of linked magic books in here that will attack if they are spawned. Head up and inside the last room when it is safe. You should now be in the Library:

On the floor there will be a short bookcase tilted back against the wall with a large book on it. Examine this to get the Golem mastery book.

Thanks to everyone who sent me tells and emails helping me find out where it was, so I could make this guide.
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