I need to run Eden's Gate again to get Deepshadow weapons??

[SamSmoot]

Let's see, they require 10 Mowen's tokens, which require 100 Phantsmagoria tomestones, when I can get from various activities.
And, one Lightweight Tomestone, which costs four Blade of Early Antiquity, which only seems to drop from Eden's Gate? I thought I was done with that weeks ago after I got all my 450 gear.

I don't see any indication that the blades drop in Copied Factory, and I haven't received any in my 2 runs so far either.

And, why not just have them drop in the factory like everything else instead of requiring this ridiculous chain of items?