There are times when you want a dungeon that feels like it could really exist, that it was naturally occurring, or that someone took natural caves and “enhanced” them to make a dungeon. There are other times, however, where you just want over-the-top fantasy architecture.
Serzen’s Seven Stairs is on the fantasy side of that spectrum – from the massive dragon-headed entrance into the dungeon proper to the central chamber complete with massive tree (or it might be a massive set of cracks in the floor where something slammed into the mountain ages ago) and seven staircases leading down to the lower levels. Rumour is that anyone who can descend each of the seven stairs and open the doors at the bottoms will either be struck dead or gain mystical powers over or against dragons. Of course the rumour is false.