The Bells of Awakening are early plot destinations in Dark Souls.
The Bell of Awakening is said to be the destination of the Chosen Undead, and when rung, the fate of the undead shall be known. Upon arriving in Firelink Shrine, The Crestfallen Warrior informs the player that there are actually two Bells of Awakening. One up above and one far below. This is essentially all the instruction and plot that is revealed upon arrival in Lordran.
Undead Church BellEdit
One of the Bells is located in the Undead Parish, up above from Firelink Shrine, which first requires traversal through the Undead Burg. After dispatching the Belfry Gargoyles, the Chosen Undead is able to climb to the top of the Church Belltower and ring the Bell of Awakening.
Quelaag's Domain BellEdit
The other Bell is significantly harder to reach. The Chosen Undead must first head downward and find their way into Blighttown, a multileveled and dangerous labyrinth. At the very bottom, past the Poison Swamp of Blighttown, in a spider's layer, Chaos Witch Quelaag is confronted. Beyond is Quelaag's Domain and the other Bell of Awakening.
Upon ringing the second bell, a short cutscene plays showing a Giant Slave hearing the bells and opening the heavy gates, allowing access to Sen's Fortress. It is at this point that Kingseeker Frampt appears in Firelink Shrine, and instructs the player that his new task is to secure the Lordvessel, proving that the player is in fact the Chosen Undead.
In online mode, it is possible to hear other players ring the bell in the Undead Parish.