It's a sword.
"Attack on Titan Sword (Shingeki no Kyojin)" by Gengar: https://www.youtube.com/@Twoneight/videos
Available for download at https://blockmodels.com.com/model/530/
The texture looks weird idk why, maybe Z-fighting...
AND WHAT THE HELL HAPPENED WITH THE PREVIEW IMAGE,
whatever, I should just continue making low poly models, whenever I try high poly ones something weird happens lol
@Gengar yep, either z-fighting or you gave your faces a 0 wide or high UV.
I would also suggest using vertex snapping for curves to have an easier time making them smooth ^^
Edit: For the preview image you probably didn't use an image that is the specified size (keep in mind that you can still edit the files)