He's not being specific hes declaring a level of skill set and ambition that will be necessary to clear Thordan Extreme.
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from an unofficial translation...
"New Relic is 3.15: Titled Anima Weapons
-First step will not be difficult
-Yoshi-P himself recommends not to go back and get Zeta and to instead just do the Anima Weapons themselves
-Zeta will have an advantage on the first step
-Advantages for Zeta will not be job-specific to what you completed the zeta on. If you have a BLM Zeta you may still gain an advantage on doing the Dark Knight weapon for example."
https://docs.google.com/document/d/1...fYTEag/preview
And even if the first step is not 'that' easy, I will not go back to Zeta. I'd rather save my Gil since I'm not rich and feel like spending what I have on just a weapon glamour.
Remember you need to have it equipped before the dungeon, trial, raid, etc ends. Whatever you toss on it can all be nothing higher than grade 1 or 2 materia as long as its still functional for light farming. Also it looks like they are making light farming easier by letting us spam the heck out of the easiest dungeons while undersized. If I'm right Zeta refers to either Excalibur 125 or 135. You might as well light farm while undersized while doing the KI farming in the dungeons if you already finished your first relic. Then start saving up gil for those craft mats and items to reach Zeta rank.
I've been done with Pld Zeta for a while and four mahatma left for my axe. I'm stopped at on light farming for Dragoon to do tanks first. but farming gil for the craft items is the most time consuming part. By the way it was written you'll get a pass for each Zeta weapon in one stage for the new Anima weapon (possibly the starting stage). Considering Dark, Mach, and Astro don't have Zeta. I'm guessing if the relics are not job locked you can use one toward either of those three's Anima weapons. However in the long run it might be better or faster to start anima from scratch than spend all that time farming a Zeta from scratch. Unless you're already at Light I or near Light II's stage on a second weapon etc, or you really want to get those achievements.
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I am curious if Anima refers to the Anima from 1.0 or if it just literally means "soul weapon" and no reference to anything else, including Bleach.