Shadow Warriors (Harmful Creatures)

Shadow warriors are only present in the following: Ancient Civilization (during nightmare phase), Underworld, When insane (do not attack player and teleport when attacked), and when using the madness amulet. They are large, shadow creatures wearing rusted armor, which attack the player on sight (unless insane) and can not be killed. They teleport around, and when attacked, blades will go straight through them, still taking damage to the sword. If killed via insta-kill explosion, it will drop 5 shadowy essence and 0.0000000001% of the time, foot of the shadow. When killed this way, the player has 5 seconds before the shadow warrior reforms out of the materials. They have a speed of 2.5 and can attack once every 5 seconds. Their attack lasts 1 second and depletes the player by half of their maximum health (effectively killing them in two hits). They follow the player for a maximum of ½ a day, or until the player is sane or takes off the madness amulet.