Board Thread:Lore Discussion/@comment-4511886-20150329140746/@comment-170.248.83.117-20180803022258

I think there's very little doubt the first sin is Gwyn rekindling the first flame, and creating the cycle of light and dark. First of all, he's the only figure from DS1 that Aldia ever mentions in his dialogue. Secondly, the theme and plot of DS2 is heavily centered on the undead curse which is directly tied to the linking of the first flame. It makes no sense thematically and plot-wise for the first sin to be anything other than that. The witch of Izalith is really just a minor plot point in comparison to the larger narrative of light and dark. If you aren't convinced, just read Aldia's dialogue, and you will find he never talks about anything other than fate, particularly the undead curse.