Hmm, after doing some testing, I think I do need to give some feedback about the balance with some of the higher tier items in this mod. A lot of them, are, well, just too overpowered for when you can get them. Take the Galactus Blade for example, technically obtainable sooner than the Star Wrath you can get from the Moon Lord, and a very similar weapon overall, but yet it does over 3 times the DPS. Without any armor, it can breach 4k dps on a single training dummy, while the Star Wrath does maybe 1.2k at most. That's pretty absurdly unbalanced.
Another example is Augur of the Elements, which is not only vastly superior to anything in vanilla or other mods like Thorium, but is also superior to everything else in your own mod, including Post-Yharon stuff. With no armor, it can easily deal 10k DPS, while Thorium's Almanac of Despair only does 2.5k at most. The Yharon magic item even does less DPS, albeit it can get fairly close.
And I'm sure there are others, I didn't really test too many comparisons, it's just something I've noticed, and something I really feel should be addressed somehow. Generally, you want to keep your items relatively in-line with vanilla progression, or else your items are just straight up superior and it starts to feel mandatory to use them and not something else. A lot of the late-game items in this mod either need to be toned down significantly, or perhaps a more preferable option would be to gate the strong ones behind some of your post-moonlord bosses, which one depending on their DPS. Or maybe a mix of both would be best, because even Post-Yharon stuff like the Augur does silly amounts of damage.
But yeah, this is something I wanted to get off my chest. The item balance is one of the only things I have to criticize about this mod. The mod as a whole is great, and I couldn't imagine myself playing without it at this point, but some of the balance with items, especially the higher tier ones, is pretty out of whack, I'd dare say. I don't think any mod's items should straight up overshadow other weapons available at any given tier, because if they do, it just destroys player choice. Is the current availability of some of these items just a placeholder?
Stuff like the Galactus Blade could comfortably sit post-devourer (even there it might still be a bit too good), and stuff like the Augur of the Elements would probably work well enough if you gated it behind Yharon. The Elemental Eruption does crazy enough DPS that it would probably fit better as post-yharon too. And I'm sure there are others, but the point is, I feel like you should go through them and spread them out in places where their DPS levels are more appropriate, assuming you'd feel like that's a better solution than nerfing them heavily.