Fallout 1 -> Cathedral
Enter the location wearing the Cathedral Children's uniform, taken from the Followers of the Apocalypse, or from Jane in the Hub . If you made a deal with Nicole, armed men—Followers' fighters—will follow you to destroy the Cathedral. You can destroy the Cathedral almost without firing a shot, or you can choose the action-packed tactic and destroy everything in your path. Talk to Laura, and she'll open a secret door behind the movie screen. Next, you should go up the stairs to Father Morpheus, on the very top floor.
If you're wearing the Children's uniform and you're alone, the mutants won't attack you. On the very top floor, in an iron locker, you'll find the Tesla Armor. You can also find some electro-lockpicks there. The second of these in the game can be given to you by Jasmine of the Thieves Guild after completing the quest to steal the necklace from the merchant in the Hub . You can simply steal the key to another secret door from Morpheus. Don't talk to him unless you want to enter the Master's lair defenseless. You can also kill him and take the black key shaped like the Cathedral Children's icon.
Next, go down to the first floor and head left to the door. Again, if you're wearing a robe and have left all your companions behind, the Nightkin won't bother you, accepting you as one of their own. Descend into the dungeon beneath the Cathedral and head to the strange bookshelf. Wait there for a bit, and the door will open. You might encounter a man from the Cathedral—it's highly undesirable to speak with him. Proceed inside the cave to the vault doors, and if you can convince the mutant guards you're here on important business, they'll let you through. Go to the computer on the first floor and use the Science ability to learn the location of the Military Base .
Next, go up to the third floor and head right (if you're playing the action mode) to the secret door to the Master and kill him. However, as you approach his location, your lives will be drained due to hallucinations and nausea, and every two turns, a mutant will spawn in the passage. Alternatively, you can go left, past the mutants. Next, use the electro-lock picks on the locked elevator door, then the standard lock picks, and descend to the fourth floor. Next, equip your armor and equip a weapon, as you'll need to kill two guards guarding the atomic bomb.
You can launch it in several ways: use science on the computer near it, with the science level being at least 100%; use the key taken from the locker at the military base near the Lieutenant; kill the Master; it will launch automatically. You will have two minutes to change into your uniform and escape the Cathedral... Then watch the cartoon where the Master, the Lord of the Super Mutants, is destroyed by nuclear fire. The main quest is complete. Also, Military Base .
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