Check out Wham!
HUGE thanks to GugerOS for making the base model and allowing me to share this! Go check out their Better Mace Hammer resource pack, it's amazing!
Highly Recommended:
This pack/mod makes the mace look more threatening, as well as adjusts the crafting recipe to fit with the new look, as well as making it a little more challenging to obtain.
If you want just the mace model itself without all the extra fluff, there is a "lite" version available for download, here.
The mace model is HEAVILY based off this video by Daniel Krafft, go check it out!
Disclaimer: This does not include the mace charge-up ability featured in the original video. (Wish I knew how to add that though lol)
Q&A
Q: Can I use this in my modpack?
A: Of course! This mod was meant for modpacks!
Q: Can I redistrubute this?
A: Unless you're in a third-world country, no.