Prism whale

The prism whale was a large sea creature native to the oceans of the planet Albion.

When Albion was first colonized, King Nathaniel I was drenched by a spout from a prism whale. His wife declared this a sign of good fortune, and it became traditional for the ruling monarch to visit the harbor of New Exeter during the Whale Passage Festival. It they were "blessed" (i.e. drenched) by the passing whales, it meant good fortune for the coming year.