An interesting choice! You have succeeded with a roll of 15 (10, +2 for help, +3 for amplification).

The effect on this building is one that translates it into and out of the spirit world -- aka the afterlife. In other words, the magic on this building is necromancy. Half Sundering, half something else entirely.

And yes, you two are now in the afterlife. Don't mind the ghosts.