I don't know why anyone would want to do this but I navigated my way through Tomb of the Giants to the first bonfire without any light so if anyone's curious on how to do it, there you go. I don't recommend doing it without having the Lordvessel already otherwise you won't be able to warp out of there and with no light, completing the whole area is a big piece of shit.
Also if you're curious, the best ways to be able to see are: getting the skull lantern by farming the Necromancers in the catacombs or you can find the skull in the pit where Patches kicks you into. It's on a body down there somewhere; you can also use the Cast Light spell; and lastly, and arguably the best because you don't need to sacrifice your shield hand, you can use Sunlight Maggot which you get after killing the red-eyed Chaos Bug near Lost Izalith.
Anyway, there it is! In case anyone wanted to know how to get to the bonfire in the dark after defeating Pinwheel.
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