Thread:ADour/@comment-32384321-20170810022809/@comment-32384321-20170810065344

The criteria for being an External remains indistinct, but in general all Externals appear to be of a sub-species that are able to recover from mortal wounds and even death itself.

Is what it says on their page and on wikipedia link the page has but from what I've read, the Externals is what the are not a group though in the comics to outsiders at first didn't understand and often thought they went from calling themselves either High Lords or Externals. This might help, in an issue Candra refers to herself as an External and that the High Lords wanted her to join them but she said no.

Again the Externals are what the are like Homo superior, cause the page doesn't really work for their still alive (well 3 are) and the rest are dead. I don't know if that help but either let me know.