Well when I reached the Marshlands Ive take a look at a sign in the road, it says: Left: Volcano Viludo. Straight: The Seventh Fort. Kingdom of Bail.
By that moment i forget the place I was heading to, so a went left towards Volcano Viludo, and when i tried to come back Shana was already sick and the game dont let me going back to the Fort, after that i was sent to gather the Dragoni Plant from the White Dragon Dungeon and when i was coming back to Lohan I tried to go to the Fort throught Volcano Viludo, this time it works and I reach the Fort just to find that all the chest were open and empty, no boss was there and all the soldiers were dead too.
I hope no one else take the bad decision as I did it.
Thank you