I feel like the unimplemented First Fractal would be a good fit. One of LC's main attacks is to summon clones of himself- exactly what the First Fractal does!
In fact, since we only have one other weapon Expert drop, from Skeletron (the other boss you fight in front of the Dungeon), I feel it'd be an even better fit!
If FF got buffed and added in, it'd be a great melee weapon for the pillars thanks to how it works. And well, it's better than nothing!