"Halloween" items is a bit too much of a forced style for dota, but the general thought is solid. I'd say October Spooky Heroes Only. Ghosts, Bugs, Demons, etc. Abbadon, Broodmother, Clinkz, Death Prophet, Doom, Faceless Void, Lich, Lion, Medusa, Necrolyte, Nyx, Phantom Assassin, Pudge, Pugna, Queen of Pain, Razer, Shadow…