I was able to beat him last night, after a gazillion tries and almost 50k worth of repairs. Granted I probably couldn't do it again, as the effin fight kept bugging all around, not just the los bug, but also some sort of AI problem with Jadus's paths. Anyhoo, came down to the wire on the first fight, I actually died after I killed him because of some DoT he cast on me, and when I saw that I had to fight him all over again (3 times btw) I almost broke the damn keyboard. Alas, I succeeded and beat his *** 3x with K (just because she could endure more damage). Stupid thing is, effin Jadus gets stronger in each fight... As previous posters said, it comes down to interrupts and LoS him. So, until the fix that retarded los bug try it, but be prepared for it to be more of a game of chance than skill.

Same thing happening to me on Jadus... I was able to get him to about 5% but with everything on cd, my companion dead and he did that massive dmg spell of his... Just logged out to avoid more stress... Glad to see this a more or less known and disseminated bug, and hope that bw fix it quickly.