Rod of Discord after 4 Chaos Elementals!!!!!!!!!!!!!!

Holy shit I just dropped the rod of discord after killing 4 chaos elementals, the 5th one was just a second ago, but you can see it on my tally counter. Its in hotbar slot 4. This is completely vanilla, no tmodloader or anything, no tweaked drop chances. I'm literally early hardmode, just been mining and not even any mech bosses beaten yet. Was down here farming souls of light for Daedalus stormbow for eater of worlds. No idea how I dropped it!