Chaufron of the Unicorn
Thanks for the great picture Tetsubo. While it isn't exactly how I envisioned the weapon, it was great to see someone else's interpretation. I'm going to use it as the official picture for the weapon.
Now, here's another magical item from one of my campaigns. This should be a challenge for ya.
Cheers!
KF72
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Chaufron* of the Unicorn
This magical silver chaufron bestows the animal wearing it the intelligence of a unicorn. The chaufron has a metal horn like a unicorn's built into its design, which is etched with runic writing. The item is the creation of the silver elves of the Great Forest of Harqual for their most prized mounts. Silver elves never allow these magical chaufrons to be used by any other race, not even other elves.
While the chaufron doesn't change the mount's alignment, armor class, or damage rolls it does allow the mount to attack with the chaufron's horn as a unicorn would with it's horn. The horn is considered a +1 magical weapon and does 1d8 damage** plus the mount's strength bonus.
Note that the chaufrom automatically resizes to fit any animal or beast usually used as a mount. However, it cannot be worn by magical creatures or humanoids.
* I'm assuming you know what this is. If you don't then let me know.
** Double the damage if the mount is in a charge.