If you have sided with humans, you will find a wounded goth there.
If you are with elves, use Jimmy’s ability to get inside through the accessible entrance.
When you get to the hall, you will have to go through several barricades.
Shoot the pipe and then the wires above it, to electrocute the first opponents.
Further on, use the vent and the probe to get to the other side of the barricade.
Use the probe to get to the vent shaft in the ceiling, as depicted at the screenshot.
Step forth a little bit to lure it and then go back and trigger the trap.
Once there, head to the basement.
There, after a short cut-scene you will have to fight zombie gingers.
The two with shields are vulnerable to fire, while the main opponent, to holy damage.
Remember that the guy’s minions have shields, so first knock these off with basic attacks.
When you win the fight, go through the door, which is farther in the basement.
Destroy the pipe and climb up from where you may shoot the valve to turn off the water.
Then, shut down the nearby generator so you could walk across the water safely.
In the boiler room you might fight the bacteria from the Big Game Hunting quest.
Immediately after you enter the room, you are being shot at by Stan or Butters.
Use the transmitter to quickly get to the balcony before you get too much damage.
Then slide down on the rope to the other side.
Stand close to the barricade - one of the missiles should set it ablaze.
Then use theCup-A-Spellon it to blow it up.
Take over the catapult and use it once.
One of your companions will take care of the locked doors.
Press on, as soon as he opens them.
A fight awaits you - either against Stan and his dog or against Butters.
When fighting Stan, roll out the big guns from the very starts.
Butters seems to be a tougher opponent because of his shield, good armour, and heavy area attacks.
Once you defeat the right hand of a given king, go up the stairs.
Now, you face the last choice: whom to help.
Attack Kyle or Cartman.
Cartman is as he is resilient to disgust and has more HP.

Both opponents deal very high damage, so remember about healing yourself regularly, almost every turn.
Once you win, a cut-scene launches, after which you have to… go to bed.
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