3rd idea:
Warden Rider:
Spawns in ancient cities (1 per):
Stats:
Easy: 750 Health (325 Hearts), 50 Damage (25 Hearts)
Normal: 1250 Health (625 Hearts), 75 Damage (32.5 Hearts)
Hard: 1750 Health (875 Hearts), 125 Damage (57.5 Hearts)
This is supposed to be unkillable, so the ancient cities are more dangerous. This enemy is completely deaf, but has incredible eyesight It will hunt the player at slow speeds around the city