Ajunta Pall doesn't remember what it is.
The Sith say Sadow is the greatest, now Janus he was. No he was not as powerful as Marka Ragnos but Ragnos although great and powerful did not lead an attack on the Jedi. It was the goal of the Sith at the time when it was said to destroy the Republic. Sadow tried Ragnos did not. Sadow would obviously be seen as greater weaker but greater.
Now why would Sadow not have a tomb or a palace? He was powerful and brilliant too, he deserved a place like that, and it was probably build before he died anyways. Why he build his tomb around the Star Map and Ragnos or Pall did not I will never know, but I can venture some guesses.
Maybe Ragnos did not care about it.
After all the thing was destroyed and it took many thousands of years before it even came close to recovering. And this was around Revan his time, during Ragnos and Malak its time the thing would have been even weaker and probably not have been able to show anything real. There was nothing around the map to show what it did either so why would Ragnos care about it?
Besides the thing showed the power of the Dark Side, Ragnos would not care about it as much as Sadow did because Ragnos was more powerful. Maybe the power of the Star Map vanished as he came near. Like you were trying to find one light candle in the middle of a freaking search light.
I don't know whatever the case, Ragnos did not build his tomb there and he would have had no reason. Sadow did but only because he felt the Dark Side there, not because of the Star Forge he had no way of knowing about it.
Originally posted by Lord Janus
Hm. So I wonder if they will tie this in with the Sith Empire having found the secrets of the Ratakan and ... what? Left known space?
Well, how would they? The other peices of the Star Map were on different planets, two of them were likely under the rule of the Republic, another in a giant jungle of walking carpets, and the final one in a planet of sand, sand, and more sand!
Yeah, this one can only be resolved by logic. The story of Naga Sadow was created well before KOTOR ever came out, this is a problem created by the game-designers. Didn't see it coming during the whole game's production.
And, by all sources, Sadow died ON Yavin lV, and his spirit trained Freedon Nadd. How there IS even a tomb for him on Korriban, seeing as how he did not die there, or even within Sith Imperial Space, seems to be an editing fluke.