Mythology

Villages should have their own mythology. With some creatures that have a 0.1 % chance of spawning. And their could be some big bosses. For a final boss their could be a leviathan that ( after all bosses are defeated) would destroy everything in its path. It would have 400 health. It would have a serpent like body with a crocodile like head with frill of coral. Another good one would be the bloviger which is part block part villager. It disguises itself as a villager holding an emerald to lure the villagers to its lair were it kills them and takes their emeralds. These myths could be on paintings, banners and in books. Drop good loot if killed because they are extremely difficult to defeat.