ISAAC NEEDS THE LULIUM. NOT NOT CONSUME THE LULIUM, IT DOESN'T GO BACK. DO. NOT. CONSUME. THE LULIUM.
Also, I just realized as I was screaming this in my head, it's rule-ium. As in, a metal that breaks the rules/exists outside the natural order, with a really REALLY corny name. Like an unbreakeable metal called Kantbrecium in a language where K and C are represented by the same letter instead of R and L.