Ragnarok

Thor will do battle with the Great Serpent during the immense mythic war waged at Ragnarok, and there he will slay the monstrous snake, yet after he will only be able to take nine steps before succumbing to the venom of the beast.

"And, slain by the serpent, fearless he sinks." - from the poem, Völuspá.

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Background image credit - https://i.pinimg.com/736x/7c/9b/52/7c9b523481b0920e1498dced9c819059.jpg

Midgard Serpent render - https://cdn.pixabay.com/photo/2016/12/30/11/08/snake-1940343_960_720.png

Thor render - https://fanart.tv/fanart/movies/76338/hdmovieclearart/thor-the-dark-world-531600bd93bb2.png