that's hard to say! a lot of old assets got touched up multiple times over the years. if we're counting things that were edited a bit, then it's the dirt paths in greenridge and that shaping for the edges of the grass. those tiles date back to march 2013 as the first tiles i made for the predecessor project. if we're talking assets that have remained as-is the longest without being updated at all, it might be the animation frames for the scorch spell, which date back to july 2013