| Arachnid Quarter | Plague Quarter | Military Quarter | Construct Quarter | Frostwyrm Lair |
Naxxramas is an entry-level raid instance floating above the Dragonblight, and is available in both 10-man and 25-man versions. It has the shape of a necropolis and has the questionable honor to serve as the seat of one of the Lich King's most powerful officers, the dreaded lich Kel'Thuzad.
A web-covered wing of Spiders and Cultists of the Cult of the Damned. Three bosses. This is the entry level quarter, usually the first one targeted by guilds to gear up their players. The trash clear to Anub'Rekhan is short, with the clears to Grand Widow Faerlina and Maexxna being progressively longer.
A wing of strange fungus, ghouls, gargoyles, maggots and other plagued monstrosities. Three bosses. This wing is only very slightly more difficult than the Arachnid quarter, with Noth the Plaguebringer being arguably the easiest boss in the instance. The trash clear to Noth the Plaguebringer and Heigan the Unclean is medium length, with Loatheb having a short gauntlet of quickly respawning maggots and eye stalks rather than a trash clear.
A wing of Death Knights and their steeds. Three bosses. This wing requires slightly more coordination than Arachnid or Plague but has no higher gear requirements. The trash clear to Instructor Razuvious is the longest in the instance, with considerable trash clears for Gothik the Harvester and The Four Horsemen.
A wing of toxic slime filled with abominations and their creators. Four bosses. Previously known as the Abomination wing in level 60 Naxxramas. This quarter has slightly higher gear and coordination requirements than the first three wings and it is reccomended new groups tackle this quarter last. Patchwerk is a considerable healer test on Heroic difficulty and Thaddius is a considerable DPS check on Heroic difficulty. The trash clear to Patchwerk is long but Grobbulus and Thaddius have short clears. Gluth has no trash whatsoever.
The Frozen Heart of Naxxramas, unlocked by completing the first four quarters. Two bosses. Neither boss has any trash to clear, though Kel'Thuzad has a three minute event every time he is engaged that could be considered trash. Sapphiron will severely test the healers of new groups. Kel'Thuzad is considerably easier on 10-man difficulty but is arguably the hardest boss in the instance on Heroic difficulty and will require the tanks, healers and DPS of new groups to play well to succeed.