The Ruins Of Requiem & Hell is where all demons fused to become the Hellslord and destroyed the place leaving what is now the Ruins. The player has to do a Quest involving the ruins.
Sigil Of Requiem
The Sigil Of Requiem contains Demonic books needed for the Quest which are:
Death - Volume 1.
Death - Volume 2.
Prophecy Of Destruction.
Hell's Code - Volume 1.
Hell's Code - Volume 2.
Sigil Of Doomsday
The Sigil Of Doomsday holds the rest of the Books :
Prophecy Of Sorrow.
Ruins Of Requiem in the Future.