Child of Loki, the giant Wold Serpent Jormungandr..
Surrounding the seas of Midgard, destined to kill and be killed by Thor at the battle of Ragnarök...
After a fierce and long battle Thor will ultimately best Jormungandr and kill him, but not before he got poisoned by the Giant Serpent.
After killing Jormungandr, Thor is able to take 9 more steps, before ultimately falling to the ground and dying from the poison himself…