The Apocalypse Twins
During the Dark Angel Saga, the Horseman of Pestilence ( Ichisumi ) became pregnant with Archangel’s heirs.
Some time after his defeat at the hands of X-Force, Ichisumi gave birth to the twins Uriel and Eimin.
Now fully grown, the Twins reappeared in the modern era, when Genocide, son of Apocalypse, contacted a Celestial Gardener. He hoped to receive the Death Seed and replace Apocalypse the new Apocalypse just as Archangel had. As the Gardener judged him worth, Uriel and Eimin appeared. Using the axe Jarnbjorn which he stole from Kang and killed the Celestial. Jarnbjorn was Thor’s original weapon of choice enchanted to break the Celestial armor the original Apocalypse wore when they first battled. .. this was all before Thor recieved his now famous hammer Mjölnir