He's completely right: that is cliché.
So's Rhindon, though. But for that reason I tried to make it a little more interesting with a bit of backstory.
In Day Run, the RPG where it was introduced (which I did not participate in), Rhindon was one of several ancient relics, but really had no backstory outside of that as far as I am aware. Voltex's character obtained it, and later he gifted it to me as a Drift Force Weapon for winning the final round of Bionifight Ultimate alongside Voxumo. Now it's Chro's primary weapon in Bionifight Ultimate: Drift Force.
My own idea of backstory for the weapon initially stemmed only from the name and powers, as I knew nothing else. "Rhindon, Sword of Ybrus, blade of light and shadow." Although Ybrus was evidently its owner or creator, the name in the title gave the sword a sense of personality, so I've decided that Rhindon is at least partially sentient. Additionally, its dichotomy of light and dark lead me to design its MOC form with a visible duality of gold and silver to represent that.
Ironically, the silver blade used in Rhindon's MOC form was slightly bent, so that it looked as though it was bending away from the gold edge. This frustrated me at first, but after a little while I decided that I liked it. The half-light-half-dark, plus the idea of a sentient weapon, lead me to come up with the idea of a weapon that's actually made from two different, conjoined, sentient blades, which both utterly detest each other; the sword is literally tearing itself apart in its rage. This anger magnifies the sheer power of the sword, but also makes it risky to wield.
So, uh, yeah. That's the story of how I made a sword with a bent Lego piece and built up background lore for it.