Dunes of Despair (mission)

Primary
Follow the path and kill any Losaru you encounter. They come in groups of 3. You will eventually reach an area with a wurm. Kill the group of Losaru bows first, with the ranged people staying back. They should stay beyond the reach of the wurm while still being able help attack. Move the ghost to the drawn bridge to bring it down. If the wurm is causing too much damage, simply scatter and wait for the bridge to lower. You will then be able to reach the wurm and kill it. Although the wurm will be continously attacking, a decent monk is enough to keep everyone alive. A hench monk is usually sufficient.

Extra: Past the bridge, to the west there is a group of losaru and the Slow Totem. The totem slows down enemies within the area where it is dropped.

Continue south, and you will encounter a boss creature. After defeating the boss, a cutscene will take place. After the cut-scene, move back the ghost. Have any range attackers kill the bows on the ledges on the sides of the bridge. Once they are disposed off, have the ghost lower the bridge. Do not rush in. Enemies will pour out in pairs. Just wait for them under the arch before the bridge. If you have picked up the totem, this is a good place to drop it. After the last wave (it's the group of 3 instead of 2), have the ghost stay on the bridge and defeat the ghost on the altar.

Bring the your ghost near the altar to start his ritual. You will have to defend him for 10 minutes. 4 pairs of arcanist will appear. One from the east, then the west, then south, then the east again. It is easier if you wait by the altar and let them come to you. This also saves time from running from one battle to another. After defeating them, quickly rush to the south bridge and defeat the 2 incoming bows. Then head to the west bridge to defeat either a pair of Enchanted Hammers, or a boss group. After defeating this group, run back to the altar, and simply wait it out. The last group to attack the altar will be whatever it is you didn't fight at the west bridge. After which no other groups will attack. The ghost will sometimes cry about incoming enemies, but there really aren't any more. You should be able to do this in a little over 2 minutes.

Bonus
Do exactly the same as the above, but at the last part, after defeating the enemies at the west bridge, head out west. Wait for the incoming group of enemies. Do this or they will attack the ghost while you are out attacking the generals. With this additional step, you should still have around 7 and a half minutes.

Quickly head back into the fort, and head south using the south bridge. The first general should be visible. Stick together because there are bugs that pop out from the ground. Further south to the left and the right are the other 2 bosses and thier groups. You need to defeat their entire groups to complete the bonus. Ignore the group of arcanists on the side exits. They will run off to attack the ghost when you enter the fort. That means you have only a few minutes to defeat the bosses and their minions. Quickly run back to save the ghost to complete mission.