In the trackless Frozen Waste, at the heart of the Sra lands lies the sacred glacier Ganamed, wherein lies Illyana’s Palace, the great ice necropolis of the Sra tribe.
Teenagers who run away from home to live in the wilderness may become feral. As they become more and more feral, they gain some supernatural powers (a la Peter Pan - ability to fly, things they imagine come true - possibly quite powerful), but at the expense of their humanity and ability to speak, comprehend complex subjects, etc. Maybe they have a leader: the most feral of them all.
A regression into a fantasy childlike state.