[Gonzo]

Originally Posted by KnowMo2724

Martyr Logarius is an optional boss, you get to him by going through the cave systems in the Forbidden Woods.

Travel to Forbidden Woods, go across the bridge, past the trap and then start heading to the left, if you keep hugging the left side of the map you'll eventually see a bunch of kennels with dogs in them, go past them and to the left there will be a cave... Go through the cave and you'll see a poison swamp, just run straight ahead past all the enemies (the loot in the swamp isn't worth getting) and you'll see another cave and when you go into it you'll see a ladder.

Once you reach the top of the ladder you will find yourself behind the locked gate at the beginning of the game and you go to the second floor of the starting room by going along the rooftops. Once you reach the second floor of Iosefka's clinic take a right until you find a room with an alien in it, on the table in that room you'll find the Cainhurst Summons.

Once you get the Cainhurst Summons head to the Witches Abode (the room where you killed the Witch of Hemwick) and go outside where the two Executioners and all those dogs are hanging out. In that area you will see a huge stone pillar/statue thing, walk up to it and you will get a cutscene that will take you to Forsaken Cainhurst Castle, which is the place where you fight Logarius.

TLDR...

Logarius is BY FAR the hardest boss in the game, IMO. There are a lot of Bloodstone Chunks in the Forsaken Castle so it's worth at least going there.

Meh, I gotta go Ebriatus.