I hope I'm wrong, but the Zodiac weapon quests..

[Kiroh]

So it goes, Relic 80 < Relic Zenith 90< Relic Atma 100 < Relic Animus 100 < Weathered Zodiac 100 < Zodiac 110

I was thinking it went more :

Relic >
Relic Zenith >
Relic Atma or Relic Animus (depending on what stats you wanted the final weapon to have) >
Meld with Weathered Zodiac through Gerolt >
Zodiac 110

Though really we could both be completely off-base and the Atma and Animus could be part of the relic upgrades while the Weathered and 110's could be part of some new weapon entirely like Gerolt's Masterworks.

To be honest we just won't know for sure until either SE explains it, or the patch goes live.