Cryptic Creature: All-Devouring Narwhal

In the most fantastical of fables, or perhaps in the most rabid of ravings, the true stars in the depths of cosmos are just as full of life as on Teyvat, while the universe itself is akin to an ocean.\nPerhaps the universe's infiltration of Teyvat has never ceased, and perhaps the drawing of borders around this world was the work of a higher will, meant to protect it.