Requirements
1x Destroy Field Rune
Method
The path is pretty straight forward, start at the marked dwarf mine and go north-west into the first hole.
Go down the hole next to where you came down from. Do this two times.
Walk north-west and go down the first hole you find.
Go down the next hole that is just south-west of where you came down previously.
Here you will find a level door where only players level 40 or above can pass.
Note, when you go down the next hole there will be no rope spot (other players can rope you). While down there, there will be a small path with some Fire Devils and Dragon Lords that can shoot and wave at you.
It is therefore highly recommended to bring a team that can kill them fast from a distance.
Another tactic is for players to go down, shoot and be roped up again from other players and repeat this until the most Dragon Lords are dead.
Once the path is clear, continue till just before the teleporter as there is a dead body underneath a fire field. Use a Destroy Field Rune on the field and take the reward. Enter the teleporter to get back up.
This article may contain quest spoiling information!