Full guide with boss in the end.. There is a lever before the last elevator down to the boss, that lowers the big fire breathing monster.. I just did that in a earlier run.
You also need to complete this dungeon, to get the last map fragment. There is an exit after the boss, that leads to a new area.
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![](https://i.ytimg.com/vi/Ktx86_PMTfw/maxresdefault.jpg)