Maurderer Challenges

Nightmare keys are found rarely in blighted biomes. Entering a spire with a key in your inventory will put you in the boss room and consume the key even if you have done that spire before. But beware! When you open the boss doors the fight will not be the same. Words will flicker onto your screen to announce the challenge, time limit, lower player armor, double boss damage, or even double Maurderers. and then the battle starts.