This quest is activated by talking to Lester the Farmer (if your character is level 15 or above). He will give you the Rune Bomb. Take it to the bridge adjacent to where you start. Standing on the bridge drop it on the alien bulb on the ground. It will blow up the entrance to the Hive and you'll be able to enter the Nest. Go back to Lester and he will give you the Auric Amulet.
This quest is immediately activated once you enter the Nest. The Defiler is the Boss of the Hive. Killing him will give you the Cathedral Map. Once you kill all the enemies in the Nest, just Town Portal out of it, there's nothing else to do.
This quest is activated by talking to Gillian if you have the Cathedral Map in your possession. Go to the graveyard by the church. Drop the Cathedral Map on the huge grave you find there. It will open up the entrance to the Crypt.
CORNERSTONE OF THE WORLD
You will find the Cornerstone of the World in a small room on level 1 of the Crypt. Drop any item on it to get a nice story. By placing an item on it, that item will be available for another character of yours in another game. Remember that you should never be in the crypt with any of the two characters that are involved in the swap for it to work. I recommend that you always save the game while in town when you want to transfer an item via the Cornerstone of the World. This quest will never show up in the quest log.
On each of the first 3 levels of the crypt you will find one Torn Note. When you have found all three, they will combine to the Reconstructed Note which tell you the best way to open the room to Na-Krul. This quest will never show up in the quest log.
Na-Krul can be found in a small room on level 4 of the Crypt. When you've killed him he always drops a book of apocalypse, a magic great sword, a magic war staff and a magic long war/battle bow. If you open his room by pulling the lever he will be a very tough opponent (except for the monk which blocks almost every hit). However, if you read the books outside his room in the correct order he will come out severely weaker. The correct order is: 1. In Spiritu Sanctum 2. Preadictum Otium 3. Efficio Obitus Inimicus If you want a special speech, use the command.txt file (the cowquest part activates it) and Na-Krul will start talking to you like a radio DJ.
THE JERSEY'S JERSEY
This quest can only be activated by using the command.txt file (you'll find this in my Download section) and replaces the Farmer's Orchard quest. Instead of Lester the Farmer you will find the Complete Nut. After talking a couple of times to him he'll give you the Rune Bomb. Drop this bomb on the alien bulb near the bridge. In the Nest you will find one gray suit lying on the ground somewhere on level 3 and one brown suit lying on the ground somewhere on level 4. Bring the brown suit to the Complete Nut and he will give you Bovine Plate.
This quest can only be activated by using the command.txt file (you'll find this in my Download section). You will find a little girl standing next to a tree close to Adria. She will only appear once you have been inside the Nest. When you kill the Hork Demon on level 3 of the Nest he will drop Theodore, the teddy bear. Take it to the little girl and she will give you a random magic amulet.