Villains have items or tools that they use, especially as weapons to rule the world or to destroy the universe. They also use these to help them get rid of the hero(s). As well, villains use these tools to perhaps torture or interrogate others to get information out of the hero or the one that they have captured. More than often, however, they end up bringing the villain's demise.
Some of the villains' tools are includes biological weapons or robots. For example, The Kaiju, drift-controlled colossal monsters that manufactured by Precursors, or Doom-Bots, which manufactured by Doctor Doom