Board Thread:Lore Discussion/@comment-7889951-20140404025550/@comment-7889951-20140410000657

If you trade the Old Lord Soul (Gwyn's) for the Item at an NPC, you get a lighting base weapon, I'm guessing they are kinda hinting it off that it is more Gwyn than the 4 Kings, since Gwyn has some lightning-ish attacks, like Sunlight Spear and is the lord of sunlight, and maybe he had too much of it and the sunlight became molten hot lava which made him the Old Iron King.