I'm a little confused here, i haven't played the game in a while and saw in scenario room in the clockworks. I was playing solo but the scenario reqiured a crystal combo, i think. I wasn't sure what to do so i skipped it. Do some scenarios require more than one player?
Most scenario rooms are just decoration. I believe you're talking about the one with two giant crystals? That one doesn't do anything, you can just read the plaque thingy. I've ran into two that actually triggered an event: a fiends-themed one with the large office, where a bunch of greavers or devilites are spawned, and a graveyard one with unending zombies that don't drop anything.