Fauchard1520
Adventurer
Is there any weapon in D&D history that rolls 3d4? I guess you could find something like the "shock truncheon" over in Starfinder...Now, if only we had a 3d4 Two-Handed, Heavy Weapon and we'd have a complete set of "the most you can roll is 12 for the base weapon's damage"-type weapons. Maybe a Great-Trident or something like that? The closest thing we currently have to this is the Double-Bladed Scimitar, which is 2d4, but lets you make a bonus action attack that's just 1d4.
Weapons – Starjammer SRD
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...But that game goes a bit nuts with leveling up your gear.