The antechamber walls were made of stone, but the doors to the foci room were made of adamantine and warded against everything imaginable (teleport, magic, psionics, undead, etc.). Despite the difficulties, Bobby and Sumiko managed to unlock the door and remove some traps, although a chain lightning went off.
When the door was opened, bad air poured out of the sealed chamber; between Air Bubble spells, poison immunity, and Clover changing into a whirlwind and venting the room as much as possible (bad air out, good air in), we were able to make the air in the antechamber breathable again.
Bobby observed that the entire floor was trapped with spikes and the ceiling trapped with deadfalls. As a cray ninja elf, he could walk on the floor without setting things off, while Sumiko pursued the road not taken and walked on the walls instead [STILL checking for traps -- dwarves, yeeesh!]. Together the two slowly mapped out the room while sharing the knowledge through the Collective. Along with the realization every square inch of floor was trapped, they both also ran across more "Davy Jones' locker" teleport circles as well as small trays of mushrooms -- no doubt the source of the fungal air contamination from before. IOW, the entire room ended up being double- and triple-trapped.
In the room's center was another chamber. After removing the traps on THOSE doorways and noting more teleport traps protecting the yet-unseen center of that room (as well as the entire ceiling being trapped with fire), Sumiko floated a mirror over so they could peak around the corner without going further inside. In the room's center was a giant 20' tall crystal -- the foci. The air crackled with psionic energy.
While Bobby and Sumiko were discussing leaving before something bad happened, Shnitzel decided to impress his bird lady by Airwalking in, squeezing past Bobby and Sumiko, and heading right for the crystal. His True Sight revealed pits covered by illusory floor (40' deep with spikes at the bottom, though no corpses or treasure). But as soon as he got close to the crystal, he triggered a huge blast of chain lightning that almost fried him to death and did damage to Bobby and Sumiko and others outside the chamber as it leaped around. Shnitzel healed himself and went to leave, triggering the same trap again.
About this time, the door started to swing shut. Carnage got his hands on it, but it was too strong for him to hold open despite his efforts. The doors clicked shut, trapping inside the only two people who could open locks, along with the most impulsive person in the party, and cutting all three of them out of the Collective and breaking Sumiko's communication with The Eye of Psychus due to all the wards.
Seeing the door was locked, both Bobby and Sumiko figured there would be a way from inside to open it (as per common sense + the other dwarf city we've explored). They searched for secret doors along all the walls, while still taking care to not set off more traps. Shnitzel on the other hand tried to Stone Shape his way through the wall near the original door and failed twice... and since the spells had verbal components, he ended up inhaling some of the remaining spores. (Sumiko put an Air Bubble on him, to protect him, but too late...) The ratfolk cleric began to hallucinate wildly.
Sumiko and Bobby managed to find and untrap (fire rune) a particularly nasty secret door in the room's back. This revealed a small chamber with yet more teleport traps... and a wall of six levers. Once Sumiko entered this area, she realized she could hear her followers again, hence she was outside of the warded area. While Bobby explored the room, she teleported back to the antechamber and untrapped/unlocked the front door from the outside, allowing egress from the room for Bobby and Shnitzel.
Trying to leave but still hallucinating, Shnitzel lost his balance and fell, triggering the floor spike trap and impaling himself. Attempts by Clover as an air elemental to grapple him and drag him out failed as Shnitzel thought he was being attacked by a monster, so he cast a Flame Strike that not only did damage to anyone nearby but also ignited the remaining spores in the air, creating an explosion that literally blew the roof off the chamber.
Seeing daylight above, Shnitzel ran up towards the ceiling. Bobby, worried about his friend, Vanished and leaped up to grab him -- but the cleric still had True Sight and could see him, so the two ended up failing their grapples and fell back on the ground, with Bobby underneath (right on the spikes). Sumiko cast Inevitable Strike on herself. Shnitzel got away again and started running. Raleigh was shouting, "Just let him go." Bobby pulled out a poisoned dagger and stuck the cleric with it, doing damage + knocking him out. Simultaneously, Sumiko grabbed the ratfolk telekinetically (64 to hit + a confirmed crit) and jerked him literally through the stone wall into the 'safe' antechamber, where Carnage tied him up before he could cause more damage.
Clover went to work to "fix" the chamber. Meanwhile, we also wanted to reset the traps and lock the doors. So Sumiko teleported back to the small room with the levers and, without much recourse, telekinetically started pulling them one by one. [I have the order written down elsewhere.] Most of them reset or (de)activated the various traps. One shut any open doors. One lever did nothing.
However, Level #2 made the crystal in the center maze grow so bright that the room lit up; Sumiko got a bad feeling and immediately put that lever back. Checking with the king later, she discovered it was the "Self-Destruct" lever [Kronk, why do we even HAVE that lever???], which in 1d4 rounds would blow the crystal sky-high in a 10-mile radius in an unsurvivable earth-shattering kaboom + likely set off the other two crystals. [Note: When we talked to the catfolk later, we discovered that their city had started to plummet over the 5-6 seconds that Sumiko had that lever pulled, since its energy was being rechanneled.]