Lady Vashj is former Night Elf turned Naga gone rogue, who has appeared over a couple of Warcraft games. In Warcraft 3
she appeared as both a villain and a playable character depending on what side you were on. In World of Warcraft: The Burning Crusade
she appeared as the last boss in the instance Serpentshrine Cavern
, she is well know for being one of the hardest to defeat bosses in the game alongside Kael'thas Sunstrider
. Both of these bosses used to be required for entry to the two hardest instances in the game, The Battle of Mount Hyjal
and The Black Temple
. The Lady Vashj boss fight is unique because she was the first boss to incorporate picking up and using items in order to defeat her.
Lady Vashj used to be the servant to Queen Azshara, The Queen of the Naga. When the queen decided that the Nagas should be know about, she sent Lady Vashj out to contact other races. Lady Vashj then allied herself with Illidan Stormrage
and they began to plan their assault on the Night Elf people, their biggest enemies. Later on Kael'thas Sunstrider
would join them and these "evil three" would escape to Outland and plan their wrath on the world of Azeroth. All three are now permanent final bosses in 25-man raid instances in The Burning Crusade expansion of World of Warcraft. All three are killable.