I wrote a guide that will give you some tips about how to search for things.
http://www.project1999.org/forums/showthread.php?t=5570
Using that, you can see the listing of npcs in cazic thule on various pages.
"
a silvered guard" is what you're looking for.
http://www.adminpage.net/eq.nsf/NPC%...=150&Expand=43