The Abyss Vs The Underworld

Artorias The Abyss-Walker is one of the knights of the roundtable Whose job was to protect Ashvale but all changed when he went to go confront manus of the abyss he was nigh in the process of corruption but he was able to some what kill manus and send him back to the void but not before getting infected by something called the Sliver of Manus( It basically makes Artorias's abyssal powers stronger even adding a couple more abilities like Void walk which allows Artorias to be intangible to physical attacks but this buff comes with the urge to kill anything that breaths)This power threatened Nashandra so she tried to send him to the place of nonexistence... the abyss but during this bout the cursed sword of Artorias somehow split his existence and to which sent him and others from his world past and future to hell and cut Nashandra's power to half but this split of worlds only made Nashandra more pissed off so she sent Void amalgamations into the unknown world to kill Artorias retrieve the World Splitter(the sword) and restore her power which now means Artorias is at a disadvantage not only does he have to fight these thing but he has to figure out where the hell he is like Why are so many lights? what are those buildings and what in Gwyn's name is a 666 news?