OK, I've finally gotten me new Legacy back from those I lent it to so I'll pop up a review, before the next one comes out next week!
Krayt revealed more of his background in this issue. After a lengthy time training under XoXaan he returned to the galaxy only to find it changed and his hated enemies, Sidious and Vader long gone. He fled to the unknown regions where he was captured by a Yuuzhan Vong advanced scout party. He was tortured an mutilated, his arm and eye replaced with Vong creations and growths sprouting spines from his back and arms. During this time he met Vergere, and listened to her, but refused to follow her teaching having had a vision of a united galaxy under the Sith. Vergere left Krayt, who eventually escaped shortly before the Vong invasion. He sheltered on Korriban during the invasion and slowly built up his new Sith Order, keeping hidden until the time was right to strike. Rcently he has called out Cade on his pretense to be a Sith, but his plan to convert him has not gone as well as he might have hoped.
No longer carrying the pretense of passion for Cade she brought him to the Dark Lord and launched into combat against him. However Cade suprised her, retrieving his father's lightsaber and thrusting it into her stomach. A kill has not been confirmed, but she won't be bothering Cade for some time.
As the issue ends Cade remains in deadly combat with the Sith who killed his father.
Hosk was brought out to be a "sacrifice" for Cade to secure his turn to the Sith Order or to ignite him with hate so he would turn over. Hosk refused to fight, declaring that he forgave both Cade and Krayt he then willingly faced death at the hands of Krayt and became one with the force, securing one small victory over the Dark Lord.
The fate of the other Jedi at Ossus remains unknown.
And that's pretty much it other than to say that Cade's friends are on their way to get him out of the temple, but who knows how that's gonna work out!