After reading the topic "the great search" several times, as well as through my own investigation, I've come up with the theory that Firelink Altar is inside the abyss.
My original reason for this was a simple look at the layout of the areas, specifically New Londo Ruins being directly below Firelink, meaning that if the hole Faampt comes out of was a normal pit, you would fall into new londo, rather then end up in the altar. Also, both Fraampt and Kaathe can take you to the altar, even though they appear in different locations.
I know from reading about the dlc that there is more to the abyss then just a black void ( to avoid spoilers I'll leave it at that), this adds to the theory that the altar is in the abyss.
Now for those unfamilar with the topic "the great search" its about trying to get the cups on the opposite side of the lordvessel to light, possibly opening the door-like wall behind them. Based on that, I've come to believe that on the other side of the door is the abyss, either a section of it or possibly the "heart" of it. Reasoning for that would be on the opposite side is the kiln, which is connected to the "link the fire" ending, so it would make sense if the other side is connected to the "dark lord" ending. (the fact you walk towards it in the dark lord ending backs that up.)
So my theory on this is, like with some of the creatures in the artbook that don't appear in the game, but do in the dlc (marvilous Chester being one) that perhaps the secret to opening the door and lighting the cups won't be in the game until the dlc comes out ( or someone playing PTDE finds it).
Any feed back good or bad on this subject is welcomed and greatly appreciated, since I've become kind of obsessed with figuring this mystery out. (also, if this has already been thought of/discussed somewhere else I apologize and could someone direct me to that topic).
My original reason for this was a simple look at the layout of the areas, specifically New Londo Ruins being directly below Firelink, meaning that if the hole Faampt comes out of was a normal pit, you would fall into new londo, rather then end up in the altar. Also, both Fraampt and Kaathe can take you to the altar, even though they appear in different locations.
I know from reading about the dlc that there is more to the abyss then just a black void ( to avoid spoilers I'll leave it at that), this adds to the theory that the altar is in the abyss.
Now for those unfamilar with the topic "the great search" its about trying to get the cups on the opposite side of the lordvessel to light, possibly opening the door-like wall behind them. Based on that, I've come to believe that on the other side of the door is the abyss, either a section of it or possibly the "heart" of it. Reasoning for that would be on the opposite side is the kiln, which is connected to the "link the fire" ending, so it would make sense if the other side is connected to the "dark lord" ending. (the fact you walk towards it in the dark lord ending backs that up.)
So my theory on this is, like with some of the creatures in the artbook that don't appear in the game, but do in the dlc (marvilous Chester being one) that perhaps the secret to opening the door and lighting the cups won't be in the game until the dlc comes out ( or someone playing PTDE finds it).
Any feed back good or bad on this subject is welcomed and greatly appreciated, since I've become kind of obsessed with figuring this mystery out. (also, if this has already been thought of/discussed somewhere else I apologize and could someone direct me to that topic).