A Dungeon Room Description

I posted this in a Forum earlier, and decided to repost it here for convenience.

The Grand Hall measures 30' x 60'. Ancient, faded murals adorn the walls; tables, couches, and other items of dilapidated furniture are strewn and tumbled carelessly about the floor. A stone alter, 3' x 7' rests in the center of the room. Small trenches are cut into the stone, leading to 6 small, golden cups, attached to the sides. Grime and filth smear the alter; no doubt, some of the stains are from ancient blood. A rotted tapestry at the far end has enough holes to reveal a wooden door.

DM: Make a listen check.

Success: You suddenly hear a loud snatch of laughter, over to your right. You feel a strange, tugging sensation in your mind, like being sucked into a whirlpool.

DM: Make a will save, please.

Failed will save: Make a spot check, please.

Successful Spot: Out of the corner of your eye, you catch a glimpse of a brightly lit room, filled with humans and demonic creatures. You feel the same whirlpool sensation, this time much stronger.
(Successful Character must make another will save.)

Failure: Suddenly, you find yourself surrounded by Succubi, Glabrezu and other demonic beings. They are cavorting (or toying) with several humans in the room, which is now brightly lit by braziers and torches set in sconces on the walls. A fresh corpse lies upon the alter; they do not seem to be aware of your presence. The furniture is, of course, intact and quite serviceable. The strange sensation in your mind is now quite strong.

DM: Make a will save please.

Upon failure, the character has been completely transported back in time, where the Demonic Cultists are holding a revel in their stronghold and are now quite aware of the PC(s).

The process may be stopped if the character leaves the room, though, at what point it is too late is up to the DM. If the character makes a save, the process is halted, but will begin again 1d4 minutes later. If a player who is hearing or seeing these intrusions from the past attempts to describe what he is experiencing to the other characters, or otherwise draw their attention to what is happening, his companions may be given a +2 bonus to their skill checks.