"Some call it 'the Realm of the Builders' - the Ark refers to it as 'Dius Factorsitius Terravae' or 'The Forge of Worlds.' My opinion? Well, I think it's more of a garden, to be honest."
-Author Dreu, van Heinhelm Household Cleric
Have a large room that elevates either up or down when triggering a trap. The floor can bring the players to new levels, where a mighty beast roams, or the floor flattens the players into the ceiling or drop into a pit of lava.