Saving the world by allowing the fire to fade and for nature to take its course. Lighting the fire only guarantees the repetition of the vicious cycle of denying nature. Much of Dark Souls taught me a lot about acceptance and to not fight fate. To let the natural order proceed and to not deviate from that, to stop others from doing the same.
I don't think it's a coincidence that every time someone wants to fight nature, people end up getting killed, harmed forever or we make some pseudoscientific amalgam of butchered flesh and human psychology.