The Transcendent Baku began as a humble dream-eater in ancient Japan, summoned by those plagued by nightmares, until it discovered that consuming the collective fears of humanity had transformed it into something far greater. As it devoured nightmares across centuries and cultures, it absorbed fragments of humanity's encounters with cryptids worldwide, becoming a repository of cryptozoological knowledge that exists simultaneously across all dimensions where cryptids manifest. Now dwelling in the liminal space between waking reality and dream, the Transcendent Baku preserves the true essence of cryptid encounters while serving as the cosmic bridge that connects all cryptid manifestations through the universal language of dreams.

The Transcendent Baku exists primarily in the dream realm but can manifest physically when summoned through specific rituals involving items from multiple cryptid habitats. Its form shifts constantly, displaying a chimeric body with an elephant's trunk, tiger's claws, ox's tail, and rhinoceros's eyes, occasionally incorporating features of regional cryptids it has encountered through humanity's collective unconscious. It can consume nightmares about cryptids, either preserving their essence in its cosmic tapestry or revealing hidden truths about their origins and connections to other legendary creatures. While powerful in the dream realm, the Transcendent Baku can only maintain physical form temporarily and must return to the collective unconscious after sharing its cryptozoological revelations.

The Transcendent Baku serves as the cosmic librarian of cryptid knowledge, preserving the true essence of encounters that might otherwise be distorted by human perception or lost to time. It selectively reveals hidden connections between seemingly unrelated cryptids to those worthy seekers who approach with respect and genuine curiosity, guiding them through dreams to uncover the universal patterns that unite all cryptozoological traditions.