Given that there are 10 Externals and 10 swords in play in X of Swords, they may be the primary antagonists of the event. They will return in the upcoming Excalibur #11, releasing in August.

The Externals are all mutants with the additional gift of immortality and, as expressed by Cable, they play an important role in the future and Apocalypse's rise to power.

Medicine: Beneath Genteel Externals 2 minute read TIME July 10, 1939 12:00 AM GMT-4 ...

In June, Bleeding Cool suggested that The Externals were returning to Marvel after being abandoned in the nineties. First named in X-Force #10 from Fabian Nicieza, Rob Liefeld and Mark Pacella.