I always enjoyed the scene in Conan The Destroyer where the wizard has transformed into a demon that lives in a realm of mirrors. I wanted to create a monster which would give a party a challenge (CR12) and give the characters an alternate way of destroying it. I also wanted to make the mirrors themselves dangerous, so I created a way for the demon to drag the character into the mirror with it (which also gives it lots of reasons to keep running in and out of mirrors).
I always enjoyed the scene in Conan The Destroyer where the wizard has transformed into a demon that lives in a realm of mirrors. I wanted to create a monster which would give a party a challenge (CR12) and give the characters an alternate way of destroying it. I also wanted to make the mirrors themselves dangerous, so I created a way for the demon to drag the character into the mirror with it (which also gives it lots of reasons to keep running in and out of mirrors).
See what you think!
https://www.dndbeyond.com/monsters/1804891-fiend-of-the-mirror-world