Problem with Od Nua Quest

[thisisntsummer]

Hey guys, 

 

I started playing Pillars of Eternity and the game is amazing, feels just like BG series. At the game, I spoke with the other Watcher guy, I got my own Stronghold and then I decided to go on this Endless Paths quest (Time and Tide - paths under the stronghold). And then I got this big problem, namely I cannot return :D

 

I jumped down to Level 5 of the dungeon from Level 1 and then I realized my level is much too low for this confrontation :D I tried to return but I cannot go directly back to Level 1 of the dungeons. I have to go though level 4, 3 and 2 first. But, I'm not even strong enough to do that. And I don't have any savegames from before. So it seems I'm stuck. Do you have any idea on what I can do?