"Into the Core"
*Darth Wyyrlok is the master of Sith lore and magic in Darth Krayt's Sith order. He has also been Krayt's confidant, spokesman, and friend. Now, seeing the further deterioration of his Master from the ravages of the Yuuzhan Vong bioforms, Wyyrlok attempts a dangerous journey into the Deep Core worlds to the birthplace of Lord Andeddu, an ancient Sith Lord, seeking to discover any secrets that might save Darth Krayt. Penetrating the Deep Core, however, is always hazardous and Wyyrlok must call upon his own core--his strength, skills, and beliefs--to simply survive. *Source: darkhorse.com
**Emperor Darth Krayt believes that Cade Skywalker, with his unique Force healing abilities, is the only one who can save him from complete destruction by the Yuuzhan vong bio-forms that were implanted in him years ago.
However, not only has Krayt failed in his attempt to turn Cade to the dark side, he and his minions have also failed in keeping him prisoner. Cade's escape has left the Emperor weakened, and his regime shaken.
Darth Wyyrlok, seeing the deterioration of his Master, has decided to seek another way to heal the Emperor... **Source: Inside front cover