About This Guide
Note: Since this guide is for events in New Game+, I’ll assume you know items, puzzles and locations that are the same as in an original path playthrough. I’ll still mention them, but I’ll only go into details for things that are different than the regular playthrough. If you get lost in some of that, please refer to a full walkthrough guide.
Start of the Alternate Path
If you checked the kitchen doors in the basement, you noticed that one of them was locked by some kind of mechanism. That is the door that you just heard opening. It will only be shown as unlocked on the map once you enter the kitchen.
There is now a cultist in the kitchen and you can go through that door to reach the B2 floor.
Note: Most things from here you can figure out just by playing. The knowledge that this alternate path exists and that this is how you trigger it is the hardest part to figure out.
This is a small area, but there are a lot of cultists here, including a red one and an axe throwing one. You can also find the shotgun here, along with some shotgun ammo, handgun ammo, medium bandage and the Sun Key.
The Sun Key can be used to unlock all the doors that in the original path are automatically unlocked when you go back to the mansion from the catacombs.
Now you need to go back to the first and second floors and basically do everything you do in the original path after returning to the mansion from the catacombs. The enemies you’ll find in the mansion are also the same you’d see at that point in the original path. On your way back after getting the Sun Key, in the B2 floor, more cultists will appear. There will now be exploding zombies in the kitchen alongside the cultist, if you didn’t kill him before.
Mansion part 2
From now on, a lot of what you do is the same as the original path, so I’ll quickly go over these things. You can immediately get the Shield of Faith from the safe (1701). Then you can get the Pluto Key and use it to get the Nebra Moon on the second floor. Going through the other Pluto door on the first floor, use the Shield of Faith to get the Earth Key. Use the Earth Key on the main hall second floor. Get the Nebra Sun and then the Angel Medallion (which drops from the red cultist in that big room with 3 different cultists). Use the Nebra Sun/Moon to get the Minerva Key. Since you took the alternate path, you didn’t need to use the door that breaks upon use up to this point, so you can use that to get to the Minerva room that has the Vesta Key quicker even if you didn’t bring the oil fix (which is used to fix that door, next to where you use the Nebra Sun/Moon). Now this is where it starts to get a bit different again.
Collecting the Crystals
Next, you need to unlock the Minerva door that’s on the second floor, near where you got the Nebra Sun. This room is just an optional save room in the original path, but in the alternate path, here you find the Red Crystal.
Battle with the GateKeeper
As soon as you pull the lever to open the gate, the Gatekeeper will appear. (If you didn’t kill the dogs from this area before, they’ll be here too, so you might want to avoid that preferably). You can see something shiny on the Gatekeeper, which means you do have to kill him. This is the third form of this boss in the original path, where he has the sickle throw and the chain attack in addition to the regular swings. Once you defeat him, he’ll drop the Light Crystal.
This fight is essentially the “final boss” of this alternate path. Now you have all 4 crystals, all you need to do is get to the ruins area.
Heading towards the end