The fourth era in the evolution of the Universe. This era will begin around 10^40 years ABB (After the Big Bang), and will end around 10^100 years ABB. When this era arrives, most of the energy of the Universe will be in the form of supermassive black holes left over from the gradual coalescense of stellar corpses. Over an unimaginably long period of time, the black holes will gradually evaporate via Hawking radiation. Because the rate of black hole evaporation is inversely proportional to the size of the hole, this process will be a very slow and lingering one.
The preceding era will be the Degenerate Era, and the succeding era will be the Dark Era.