Talk:Chaos Witch Quelaag/@comment-39923621-20200104205015/@comment-2A00:23C6:A784:B800:CA2:AA9D:E053:5617-20200127114811

She's completely optional, same as the rest of the bosses in the game: if you wait long enough the fog gate blocking your progression dissipates with a popup onscreen saying, "The old magic has faded", you have a short window in which you can go through the gate before it closes permanently.

Though if I was to take this comment seriously then I'd actually say that her boss room is blocking the only way into the demon ruins and the second Bell of Awakening, so yes she is entirely optional you can go right past her if you have the witch's ring.