Messmer's roots discovered | Elden ring shadow of the Erdtree lore

I discovered the mythological figure Messmer was made after but what does it mean and what can it tell us about shadow of the Erdtree, i believe it explains alot.

Chapters:
00:00 Messmer's inspiration
02:03 Serpent God
02:36 A god of war
03:06 New ties to dragons
04:35 Lord of the good tree
05:13 The ouroboros
06:05 Messmer's banishment
07:07 Messmer's goal in the DLC
08:02 Messmer's birth

Articles about Ningishzida:

https://en.wikipedia.org/wiki/Ningish...
https://www.britannica.com/topic/Ning...
https://religion.fandom.com/wiki/Ning...