Is there a quest you can pick up before going into this dungeon just like the 3 anasteria gave out for the first 3 one shot dungeons in the game?
Yep,at the entrance.
hmmm where exactly is it ? I still see a rock at the stairs in Ugdenbog
See this below:
I made the same mistake during testing. 
To be honest that is the first place where i looked. I really thought it was at that place. 
Yeah, me too. Made a beeline for it and then stood there thinking wtf?
Found it eventually, but that wasn’t anywhere near where I thought it was going to be. Sneaky devs. 
Same here. 
I also thought it’s the staircase at first :rolleyes:
Yup, same here. That staircase better bloody lead somewhere at some point, it’s too important-looking not to. 
Perhaps…
…it’ll lead to v1.0.6.0.'s Hentacle Monster arena?