Is it worth doing the book grinding for Zenith weapon at Level 80 WAR?

[Rongway]

Honestly, I might stick with it, then, for that Lv.80 form; might take a bit to grind through all of that, but if anything, at least I'll have had it done, then. Thank you so much! <3

The relics at each cap level are separate. If you want the Lv80 relic skip 50, 60, 70 and start a fresh Lv80 relic quest line in ShB content.