Silithus is a contested level 55-60 zone in southwestern Kalimdor. Most of the story is revolving around the rising activity of the silithid and the Twilight's Hammer in the area, and will lead adventurers that arrive to Cenarion Hold to deal with these threats.
Saving Noggle quest chain
Twilight Geolords quest chain
The following chains unlock after completion of Twilight Geolords chain:
Hive'Regal quest chain
Hermit Ortell quest chain