Hammer of Justice 3D
Renaming the mace to "Hammer of Justice" changes it to look like Gerson's weapon from Deltarune!
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Hammer of Justice 3D

So I was playing survival and whacking some sheep with an axe pretending to be Gerson, and then I thought, you know what, this would be a pretty cool resource pack.
So I made this model, and while making it decided it would better fit the mace rather than an axe. It was also after this that I searched up "Hammer of Justice" on Modrinth and saw there was a similar resource pack, but a 2D texture, so I just slapped on the "3D" title.
The model turned out SUPER well, and it looks genuinely really cool!

Take a Mace, put it in an anvil, and rename it to: "Hammer of Justice", without the "". It's that easy!

Despite using EMF and ETF while making this, I believe due to newer updates (1.21.6+), you can use this with ZERO mods! Just put it in your resource packs folder and enable it!