The Oracle's Cave was a network of Caverns which were apparently the home of the Oracle of Nosgoth (Moebius.) They were featured in Blood Omen: Legacy of Kain and were revisited in Legacy of Kain: Soul Reaver .
- "The Oracle’s Cave, where Kain’s first fateful meeting with Moebius occurred.
Moebius played the role of a doddering soothsayer, stirring his pot of visions while dispensing enigmatic predictions to gullible visitors. Underneath the facade was Moebius the Time Streamer, sorcerer of the Circle of Nine - a ruthless manipulator with the power to bend time. Since his murder at Kain’s hands centuries ago, these caves have stood vacant... though, like Moebius himself, they are rumored to be only a facade for a much larger, more elaborate complex...
I sensed that Kain was here... and at that moment, I would have plumbed the depths of hell to find him."
- ―Raziel — Listen (file info)[src]
In Blood Omen, shortly after his encounter with Malek in Malek's Bastion, Kain sought a way to defeat the Paladin and was directed by Ariel that the Oracle of Nosgoth (actually Moebius the Time Streamer) might be able to aid him. He entered the Cave and found a maze of caverns with many deadly perils, however he was able to find the Spells 'Stun ' and 'Incapacitate ' and a Blood Fountain to protect him from the snow. Passing through the caves, he eventually entered the Moebius's Museum, and found The Oracle's Chamber, where Moebius awaited. Moebius gave Kain a series of cryptic clues regarding King Ottmar and the Legions of the Nemesis, before advising Kain to seek Vorador in his mansion in the Termogent Forest Swamp, advising Kain to follow the Ignis fatuus to find it.
Raziel also travelled to the Oracle's cave pursuing Kain, on the advise of both Ariel and The Elder God . As Kain had done before him, Raziel fought his way through the Oracle's Cave, now populated with Adult Turelim, through the Empty Moebius' Museum and into the Oracle's Chamber itself where he discovered that The Oracle's cauldron was not only still present, but also still lit. Raziel was able to use the cauldron to unlock a passage into a larger, more elaborate complex, where he not only found a statue of Moebius himself, but several 'portals' which showed Raziel visions of a potential future (which was actually the Original Soul Reaver Storyline.) The passage led to the Chronoplast .
In Blood Omen, Kain passed through Moebius' Museum just before he reached the Oracle's chamber. The Museum was a collection of artefacts from different timelines that effectively foretold the mistakes that Kain would make on his quest. It contained two shields, a red banner, a guillotine, a doll, a set of Sarafan armour and a book written about them
Each object would turn out to have relevance: The Book and the Armour were both Sarafan artefacts related to the Paladin Malek, who Kain was pursuing at this point. The Doll was the Dollmaker'sDoll that Kain would later collect to help him enlist the help of Willendorf in the Battle of the Last Stand, indeed one of the shields bore the sigil of Willendorf and was apparently worn from that battle. The other shield and the Red banner bore the signs of Moebius Mercenary Army, and the Guillotine was the one used to behead Vorador (it was apparently still wet with his blood). The last three objects were retrieved from after the Reaver paradox that created the Second timeline and it's resulting change in the timelines.
Raziel was able to visit the Museum room inSoul Reaver, but all that was there was the tattered remains of Moebius' banner
The Museum does appear to 'bend' a few of the rules of time travel within the series (as history is rewritten), although if anyone had that power, it was Moebius.
The Museum also contained some unexplained objects; there was a golden picture on the wall, which had what appeared to be skeletal remains beneath it; there was also a golden chalice on the floor next to the armour (which may represent Vorador, given the cut-scene between Kain and Vorador); of most note however, is what appears to be a Shotgun, as this is the first and only depiction of a gun in the series, though there were cannons in Soul Reaver 2.
The Oracle's Chamber
The Oracle's Chamber, also known as the Oracle's Lair, the Oracle's Cave or simply a Cavern, was a significant chamber within the larger Oracle's Cave encountered by Kain in Blood Omen: Legacy of Kain and Raziel in Legacy of Kain: Soul Reaver and was the site of Kain's first meeting with Moebius in his guise of "The Oracle of Nosgoth".
- The Oracle's chamber is mentioned indirectly as the "Oracle's Lair" in Blood Omen transcripts, but is only referred to directly as the "Cavern". Soul Reaver stage directions refer to the room as the "Oracle's chamber" whereas Raziel himself only directly refers to it as the "Oracle's Cave".
- The Oracle's chamber is notably an incomplete room in Soul Reaver models - as the walls are moveable in cutscenes they are counted as an object and thus do not display along with the rest of the room model.