It's really cool that you've finally ported this mod over to 1.4, but when I'm looking at the changelogs, there's some things I don't get, or understand the reasons behind.
First off, what's the motivation behind removing the Terra Staff and Terra Bow, along with their components (and the Blood Thirster)? I thought it was cool seeing the mod have equivalents of the Terra Blade for the other classes (as well as a proper Crimson counterpart to the Night's Edge, even if Calamity has its own), and it's sad to see them go. And if you removed the Terra Staff and Bow, then why does the mod still have the Terra Knife and Scythe (as well as their components, including the Embowlment and Blood Harvest)? (If the Terra Bow and Staff and the Blood Thirster were removed because Calamity has analogues, I don't really get the logic there, because I always thought the Thorium mod was supposed to be a standalone thing that didn't rely on other mods to be enjoyed.)
Second, why was the Gnome Horde removed? I liked how it gave a bit more variety to the surface Hallow biome, which I always thought kinda felt empty in vanilla. Was it removed because of how the vanilla game has its own gnome enemy now? Are you planning more surface Hallow enemies in the future?
Finally, what's the "full overhaul process" that's mentioned in the wiki's changelog for 1.7.0.0? How much of the mod are you planning to change with that?
Otherwise, this mod is still really cool, and I'll be sure to play it when I get into Terraria mods for real.
(As an extra request that's not related to the 1.4 port, can you please change the capitalization of the Zunpet to "ZUNpet"? The creator of the Touhou Project always capitalizes his pen-name as ZUN, and as a big Touhou stan, I'd like to see that proper capitalization get reflected in this mod's Touhou reference.)