Kill the rat god

Kill the rat god is a side quest in Fallout 2.

Detailed walkthrough
There's a big problem in Trapper Town, the west end of Klamath. Slim tells Chosen One he thinks there's something in the caverns below controlling the rats that have been infesting the place.

The key to the warrens door can be obtained in one of several ways, including:
 * Convincing Slim to give it to the Chosen One.
 * Stealing the key from him.
 * Picking the door lock.
 * Sleeping with Slim (Female character only)
 * Killing him and taking it
 * Feeding the dog near Klamath's town center a piece of meat jerky (he'll cough it up and follow the Chosen One around)
 * Clicking Barter, then trading for the key (it has a value of 0, so he'll accept any amount offered.)

Once in the warrens, the Chosen One must battle their way down through the caves until they reach the second sub-floor. There they'll face Keeng Ra'at the rat god, the brains behind the invasion. The giant rat has a very high amount of HP, and is a difficult creature to kill. If it is hit with a Critical Hit to eyes, no matter the damage - the rat will be always killed. (Critical Hits to the groin have been proven to not kill him instantly)

Rewards

 * 300 XP
 * +50 Karma

Behind the scenes
When the quest is completed and the Chosen One talks to Slim afterwards, he will state how they are a regular "Pied Piper". In accordance to the goal of this quest, the 'Pied Piper' is a mythical character said to have removed an infestation of rats from the town of Hamelin during the Middle Ages.

Убить Крысобога 杀死鼠神