Naxxramas is the entry level raid instance in WotLK. It is an ancient ziggurat that serves as Kel'Thuzads base, his necropolis, from where he spreads his evil plague throughout Azeroth. It once floated above the Eastern Plaguelands but since Kel'Thuzad has been defeated there he moved his city to Northrend where it now floats above the carrionfields in Dragonblight.
There are 15 evil bosses that have their hideout in Naxxramas, all waiting to be defeated. The necropolis itself is structured into four separate wings. When the group enters the instance they'll find themselves in the middle of the city and can then pick out one of the four quarters.
All raid instances in WotLK allow groups of 10 and 25 players to enter.
druid (Feral tank)
druid (Restoration)
paladin (Holy)
paladin (Protection)
priest (Discipline)
priest (Holy)
shaman (Restoration)
warrior (Protection)
deathknight (Frost)
In short: healers and tanks of all shapes and sizes. If healing/tanking is not your main spec, any application you make will be on hold until we reopen applications. You can also consider becoming a guild friend first.