Board Thread:Wiki/@comment-5774380-20191209053847/@comment-44633782-20191209183435

Nidhoggr is a serpent who resides at the root of the world tree. The spine organism was a serpent-like organism residing at the root of the titan tree. Jormungandr is the world serpent, a giant serpent whose appearance marks the beginning of Ragnarok, or the end of the world. Eren just transformed into a gigantic serpent-esque creature right as he kicked off the end of the world. If you're someone who believes that Reiner is Helos, it would mean Jormungandr is defeated by Thor (Reiner) who then dies from his battle wounds. The parallels to Norse Mythology are clear, and you don't have to look much further than the Goddess Ymir making an appearance and playing the same role he/she does in Norse Mythos AKA being the origin of all the titans.