The Neo Warclan were the most prominent of the Neo clans. The Neo were a subsect of mutant-humanity that retreated from the outside world and lived in isolation, evolving along a slightly different path. When the High Evolutionary's genetic regression wave removed all mutant powers of Earth, the Neo suffered a catastrophe as so much of their society was based around their powers. Domina and her Warclan ventured out into the rest of the world for revenge.
All Neo on Earth, Warclan included, were killed in X-Men Giant-Size #1 when Phastos's remaining Evolutionary wiped out their genetic strand.