Spoilers

Legendary sightings

Mythic creatures have their own territories. A suitable biome alone does not guarantee a sighting. Some only appear at night, and sea creatures require you to be on the water, either in a boat or swimming in deep water. Finding one is still a chance encounter within its territory.

The Legends journal records a mythic sighting when you actually see the creature. A creature arriving out of sight does not count. Once you have met or defeated it, its territory stops giving the same atmospheric clues.

The Hollow Hart, the Cinder-King and the Gravewalker roam through the world. Guards and captains can offer bounties when a living boss is close enough to their settlement. The offer gives a lead towards its current region. After a kill, return to the giver for the bounty.