Back in Nagapur, in the upstairs left corner of the pub, you will encounter a woman standing against a railing. Accept her task and head off to Dillmor. You will get the plateau key. Head forward up the mountain until you come to a bridge. Cross the bridge and take the path on the right. Keep going forward until you find a door where the plateau key fits. You are now in an underground passage, head to the right. When you come to a doorway go through it. When you come to a large room, with a gap you can't cross head left. Take this straight until you find yourself on the other side of the gap. Use the pulleys to head down and continue straight until you reach a large chamber. At the end of this chamber is a door, go through it and the following chamber after. Ignore the door on the left. When you find the yourself in a chamber where you can go no further forward, then take the door to the left. You will come to another elevator take it all the way down. Go straight as far as you can and enter the chamber at the end. Head left to re-enter the main room and take the door on the right. Eventually you will come to an edge where you can see beatles. Your host will now mention that the warrior you are looking for is probably one of these monsters. Slide down the bank and start killing bugs. After you have killed enough bugs a creature called Mantroskylo will appear, he is your real target. It is easiest to kill him with mystic attacks. Don't worry much about the other enemy unions the quest will be over when you kill him.