Xyster is the solo project of Zekenfraut from Anno Domini Mortus. Only two albums have been released. The second album 'Cracks in the shell' contains elements of "Drone", Experimental, Melancholic piano, grim voices and atmosphere. Read more: http://blogs.myspace.com/index.cfm?fuseaction=blog.view&friendId=293857417&blogId=503464773#ixzz0yo92Gsxx
Xyster a is Thrash/Speed Metal band formed in the 80's in the UK. Lyrics themes: Death, Anti-Christian, Violence. You can listen to their (only?) full length album "In Good Faith" (1989) here: http://vibrationsofdoom.