We’ve noticed, that in the ‘ancient tomb’ dungeon of the “good” storyline is quite difficult for players to traverse through. Not because the enemies are too hard, but because alot of players seem to not be able to find their way through.
Now, if you don’t want the extra help, you can stop reading, and try to figure it out on your own. But if you DO need the assistance… here, in this link, we’ve provided a ‘map’ of sorts. Follow the red lines to the staircases as shown. (On the third floor, you’ll notice blue and green circles, these are teleportation crystals. Go to the blue circle first, than the green circle, and from then on you can reach the boss with ease.)

http://imgur.com/a/QWxH2