The old and new generations of X-Men as well as the Atom Institute students, united forces in order to prevent the Beast army from getting the Phoenix Egg which started to hatch once more while they battled. Emma Forst, who had combined her powers with the Stepford Cuckoos to become the Six-In-One, started to shut the Beasts down one by one before turning her attention to their leader. Reading his mind, Frost discovered that the real threat was Sublime, a sentient bacterial life-form which laid hidden inside the Phoenix Egg until it was discovered and used by Magneto. Tired of being used, Sublime managed to spread his spores all over Battleworld, infecting and assembling all the versions of Beasts (its perfect host) it could find to take control of the Phoenix Force inside the egg. Shortly thereafter, Sublime took control over this domain Hank McCoy and used him to kill Esme, breaking the link between the Six-In-One. Sublime afterwards got the upper hand over the X-Men. As everything seemed lost, the disembodied mind of Professor X possessed Quentin Quire's corpse reanimating it and used his powers to finally destroy Sublime ending his threat once and for all. But the battle wasn't over yet as Cassandra Nova emerged from the Phoenix Egg in possession of Jean Grey's body and the Phoenix Force.