Appearance:

The creature looks like a 2 meter long red and bloody skeleton, it has fiery hair and a scorpion-like tail.

Voiceline?

!MAERCS ruoy raeh lliw ydoboN
!NIAP ruoy raeh lliw ydoboN
!LIVED ...mA ...I
!ENOLA era uoY
!EM morf uoy evas nac eno oN

Trivia:

1) The exterior of Undying was inspired by its original design from FNaTI 1.0.
2) Undying is a demon.
3) Undying talks backwards.
4) Undying's favorite food is Ketchup.
5) His actual new design was inspired by the Shredder from TMNT 2018.
6) The Undying fire is very hot, but it does not ignite objects around it.
7) Undying was called up with the help of the book: "The Lesser Key of Solomon"