to add to all the comments above :
Informations about Shadow World and various informations about
K'Ta'Viiri in Space can be found in : Imperial Crisis and League of Merchants.
( First one for Ceril VII, the Starmistress of Ceril VII adventure and the Heart of K'Ta'Viir [ I have doubts, the Heart
might be in Lost Telepaths ], second one for Vliir K'Tan, Moryn Kaldo and a few other ).
Technology meet Magic sites in the Spacemaster universe are :
Ceril VII ( Shadow World )
The Dark Nebula ( Dark Space )
Terraga III where some people developed some kind of magic.
You can also dig in the old forum archives, there's been several threads about Spacemaster and Shadow World mix.