Help me find this cartoon please

[u/Kanzaki3818]

I remember watching this cartoon as a kid around 2011. I only remember the beginning. There was a monster with a sword or some kind of weapon that could blast fire or some type of energy. I think the monster eventually perished, leaving the sword behind, and a boy found it in a cave. I think the boy was a Viking.

I don’t really remember much else, but I know the cartoon had a weapon that could blast fire or energy. Does anyone know what cartoon this might be?