Rework the Moon Lord part of the progression
there are many problems that have been brought up with this area of progression, and this is sort of a mega-sugg to present a fix for all these problems.
Step 1: Change Meld stuff to "Astral Fragments" and modify the loot to be more Astral themed.
It's been said that Xeroc armor needs a name change anyway, so why not use this opportunity to do this? Astral Biome needs more love, and it would fit with the next step of the sugg.
Step 2: Add an "Astral Pillar" that spawns above the Astral Meteor. this will spawn Astral enemies and drop the aforementioned "Astral Fragments".
It makes, frankly, no sense for the mage-themed Pillar to drop rogue fragments. This would also be cool as very few mods add new Pillars (iirc Tremor is the only other one that does). In addition to being neat, this would help new players to the mod get to know the Astral Biome, as many just glance over the place without ever knowing about the two bosses that reside there.
Step 3: Change Astrum Deus into either a Miniboss or buff it and its drops to Post-ML.
Imo, Astrum Deus is a big speedbump in the progression leading up to the Moon Lord fight. There are two effective ways of fixing this: make it a miniboss while at the Astral Pillar, or buff it to make it Post-ML. I like the boss, but I feel it should be moved in progression. This step is probably the most optional out of the three.
I know this sugg is long, and i have no clue how difficult it would be to code, but I feel like this would polish up this currently very messy area of progression