When I think of the nature of Dark Souls I imagine an intertwined secret sub-community and death... death complemented by player anger. In Dark Souls when you die repeatedly you're filled with anger. I imagined a creature that would manifest solely off the anger of player-death to become increasingly stronger the more souls it collected. The nature of the creature would feed on the secret sub-community's unfortunate deaths, to create more misfortune and death. Woooooo... morbid.
As far as the literal sense of making it goes, it's just hand drawn with pencil on paper.