And speaking of dragons, they might be the first mount that can fly unless some bird animals large enough to carry the player on it's back is added in this game as the early flying mounts that can be gotten, there can also be some buildings and stuff to store them in as well if he wants to add that in the game.
like a gryffin or pegasus. i wonder how you encounter them however.... maybe a a adult dragon who flew far away by accident is lost and you have to find a way to get it back? and afterwards you would get a faster way to travel and or the dragon... but for pegasus maybe you could get grabbed by a unholy demon and a pegasus saves you? maybe some kind of demon was going for some random human to use for some purpose and maybe you can resist the pegasus and get a new ending? eh speculations but dragons and other flying mounts would be fun.