User blog comment:Metadwarfosis/In anticipation of volume 11- Dwarven Kingdom and Expectations/@comment-178.175.66.8-20160813130218/@comment-29037426-20160814003846

Could it be possible that the girl is one of The 13 Heroes. Could be alive as Rigrit is proof. My reasoning is how he said "that girl." If you infer based the use of 'that' PDL assumes Rigrit knows who she is. Could also be another human which has a strong innate talent or a hero-human that may need hibernation as we know from vol. 9 that it is cold from how the Emporer needed a magic cloak to regulate his temperature.