The Bard's Tale IV: Director's Cut

It's easy to miss, in the Mangar Tower that is behind the Duke, go through all the riddles, at the end there will be a bridge in the Strala, this bridge leads to the boss, but don't rush to it, turn around and go down the stairs, there will be a portal, go inside and go through 8 waves with skeletons and see a snare ahead after the battle