From Pathfinder Lost Omens Character Guide, which isn't enabled.

Irriseni Ice-Witch

FEAT 13

Prerequisites Jadwiga ethnicity; wintertouched human heritage

You can trace your direct descent from one of the Queens of Irrisen and thus from Baba Yaga herself. Your resistance to cold increases to 5 + half your level, and you can cast 5th-rank Wall of Ice as an innate arcane spell once per day.

Pathfinder Lost Omens Character GuideOGL