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All players by default start at this tier. Level is capped to 60. Note that these two tiers are available simultaneously, as was the case for original Vanilla release.

Blackwing Lair is now available. Players are able to enter without having defeated Onyxia, but will not be able to survive Shadowflame without the Onyxia Scale Cloak, so this tier has a natural RPG-style progression requirement.

The AQ war effort is now required. To complete the war effort every player needs to complete each resource turn in quest at least once. After that the quest to complete the war effort becomes available. 1000 Commendation Signets are required to complete the war effort. Zul'gurub becomes available in this phase as well.

This tier is for the AQ war effort and the Scarab Lord quest chain to open the gates. The quest chain becomes available after the war effort has been completed and ends with the player ringing the Scarab Gong and opening the gates of AQ. If desired, the Scarab Lord quest chain can be skipped by completing the alternative Simply Bang a Gong! quest available at the Scarab Gong.

During this phase the AQ war is active. This phase ends after completing the new Chaos and Destruction quest. The AQ20 and AQ40 raids are available, the gate to AQ is open. However, the quest NPCs for AQ equipment are not available until after the war ends.

This phase requires players to complete AQ40 to continue, but they will also now have access to the catch-up gearing quests in Silithus and good gear and skill upgrade books available in AQ20.

The Light's Hope chapel and its associated quests and NPCs will now be available, allowing for attunement to Naxxramas. Once attuned, players can enter through the Naxxramas teleporter in EPL. The Scourge Invasion is also active during this tier. Although it can't be completed, it will end after Kel'thuzad has been defeated.

This is a short phase. Enemies are coming out of the Dark Portal. Help the Argent Dawn defend against the incoming invasion.

Players will now be able to enter the Dark Portal and level up to 70. Attunements will be necessary to enter the TBC raids, which will require completing TBC heroics.

Players will now be able to complete the next set of attunements and enter the next set of TBC raids.

Players will now be able to complete the next set of attunements and enter the next set of TBC raids.

Next players will head to the Ghostlands to complete Zul'Aman.

The Isle of Quel'danas will now unlock, allowing players to complete the questlines there and enter Sunwell Plateau.

Players will now be able to enter Northrend and level to 80.

Players will now be able to enter and complete Ulduar, with its associated quests.

This tier unlocks the Argent Tournament and its associated content.

Players will finally be able to enter ICC and challenge the Lich King.

Players will be able to complete Ruby Sanctum, which is the only content unlocked in this tier. (It can be considered a "bonus tier" since the real story is completed after defeating the Lich King.)