North dark room

[fel]

I have 3 of the shards in north, but the last one that is in the dark cave is not making sense. I cannot get past some kind of wall. How do I get past it?

http://steamcommunity.com/sharedfiles/filedetails/?id=658655427

[GG111]

post a screenshot, easiest way to help you

[Gustaw]

You need to beat area boss first.
Whenever there are blocks with arrows blocking your path they show which area boss needs to be defeated in order to pass.

[renkencen]

That one is misleading. Eventhought the map indicate that area to get the shard. It is NOT one needed in order to fight the boss.
As Gustaw typed, you have to clear the boss in order to access that room.
To get the fourth shard eventhought it's pointing to that room. The actual location is at NE from the Warp point. You basically heard North and then turn right and then head down (kinda similar to the other direction to the other shard before the last one).
Granted getting the fourth shard from there was tricky as it is not in plain sight (hidden). Somewhere in that dungeon, you will at point be in a rectangle room and clearing the mobs to in order to advance. The door is NW from the rectangle but instead head SW toward the wall which will reveal to be a pathway to the last shard,