I've started the mystery of fürstenstein and I've skipped most of the dialogues and don't know what to do since in the quest log it doesn't say where to get the info and I've checked the walkthrough and couldn't find one about the quest anyone who'd help me out?

There is a dungeon entrance in the top right corner of the map, which'll get you to the inside of the city. There, you can find a few sparkling spot, which'll tell the story of what happened in the city in the past.

There's nothing up there besides an igloo and Millwater.

walk past the bridge go east side and go up