When Japanese mountain pilgrims encountered the Yeti centuries ago, they sent the Tsuchinoko Sage as an emissary to establish a spiritual alliance between Eastern and Himalayan cryptid protectors. Recognized by Tenzin Norgay's ancestors for its profound wisdom and diplomatic skills, the Sage became the Guardians' most trusted advisor on preserving the delicate balance between human curiosity and cryptid sanctity across cultures.

The Tsuchinoko Sage possesses the remarkable ability to compress its serpentine body to squeeze through impossibly narrow mountain crevasses, allowing it to access hidden shrines and secret passages unknown to human explorers. It speaks in ancient riddles that contain encoded knowledge about cryptid sanctuaries worldwide, comprehensible only to those deemed worthy by the mountain spirits. Though physically small compared to the Yeti, the Sage can project illusory images of various cryptids to confuse and misdirect those who would disturb sacred sites.

The Tsuchinoko Sage serves as both the Whiteout Guardians' living archive of global cryptid knowledge and their primary diplomatic channel to other cryptid protector communities worldwide, ensuring that the sacred balance maintained in the Himalayas is preserved across all cryptid habitats. When Frostbite Seekers approach too close to discovering the Yeti's true nature, the Sage creates elaborate false trails and misleading evidence that preserves the mountain's mysteries while satisfying human curiosity with carefully crafted half-truths.