In Exocraft, add an elemental gaurdian that’s spark, lava and aqua. It could be called the elemental gaurdian or the rainbow gaurdian, and they gaurd rainbow/elemental mines. Also, you could add elemental/rainbow drones, and also make some of the rarer crew members have elements. You can also add a self repair-drone that can repair your ship, but it costs more than if you do it in the hangar.