Yeah, explain. It's still better idea than Melee having sniper range weapon w/o Mana cost. And it's easier to obtain than comparatively inferior Terraprisma.
First of all, the main reason this weapon is so powerful because it's post-Moonlord. What did you expect from a sword that requires the Moonlord to die multiple times, plus requiring many different swords from different stages of the game? At that point there's not really any "higher threat" that would make the Zenith too overpowered in its stage.
Second, the Zenith got its name from the same word, which means "the highest point reached by a celestial or other object" (according to Google).
In short, the Zenith is the most powerful sword in the base game, so it being the "highest point (AKA highest tier sword)" would fit the weapon knowing its potential.
Changing it is most likely a bad idea.
Third, every current Master mode drop is either a pet or a mount. Besides the Toy Tank, none of these cosmetic drops deal any damage. So why would the Zenith, a melee weapon, break such a pattern? Sure, Master Mode is tough (despite there being only stat changes for the bosses), but the exclusive items are for cosmetic use only. Plus this would make obtaining the Zenith easier then how its currently obtained.
Fourth, the only reason the Terraprisma is hard to obtain is because the boss that it drops from oneshots you at the time the boss has to be fought to obtain the summon weapon. It may be weaker then the Zenith, sure, but it's proven quite powerful and stands as a good alternative to summon weapons obtained after it (even supposedly being more powerful then the Stardust Dragon with the right setup). Also, you only have to kill the boss
once at day to obtain the Terraprisma compared to killing the Moonlord at least twice just to get two ingredients for the Zenith. You also need
twelve more swords, five of them combining into one, and a third of those twelve swords are obtained after the mech bosses.
Have you
actually tried crafting the Zenith, or are you just saying it's easier to obtain just 'cause?
I think the Zenith is better off staying where it is, without needing any crazy nerfs or lame tooltips. Deal with it, because I doubt it will ever be changed in your favor.