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Bastion of Twilight is an entry-level raid instance introduced in . It features five bosses plus one optional heroic boss. World of Warcraft: Cataclysm 
The Bastion of Twilight, along with
Throne of the Four Winds and Blackwing Descent, is meant to be the "Naxxramas" of Cataclysm: an entry level raiding.  
The instance entrance is located on top of the
Twilight Citadel spire at in southwestern [34, 78] Twilight Highlands overlooking Loch Modan.
Several of the encounters have be announced so far; they are:
Upon defeating Cho'gall on heroic mode, the floor beneath players will collapse and they will fall into a cavern of flowing lava and
"a very large number of black [sic] dragon eggs" that hides a ". horrifying secret"   
25man.com Bastion of Twilight Tactics & Strategy Guide
Icy Veins Comprehensive encounter guides for Bastion of Twilight