Enna Core is an advanced technique that allows a single Lighthouse to do as much computation as nine of them with each side handling a different set of calculations. On a purely theoretical level, it is an extremely simple skill, though in practice it is very difficult since even dividing one side of a Lighthouse causes a massive overload. As such, normal Lighthouses cannot utilise Enna Core. File:Upgrade kit.png By upgrading a normal Lighthouse with using the A-graded "Enna Core upgrade kit" secretly produced by the Workshop, a Lighthouse then use Enna Core.