Originally posted by S_W_LeGenD
Valkorion did not create holocrons and document his knowledge and capabilities in them. As another member remarked - Valkorion is among those who took his secrets to the grave.Palpatine most likely 'assumed' that he knew everything, but this is not true. I see that DE Sourcebook statement in this light.
By the way:
In his relentless pursuit of immortality, the Emperor explored the most sinister, uncharted depths of the dark side.
From (Star Wars: The Old Republic: Encyclopedia)
Didn't all those Sith Lords who were not Korriban-ish do that?