After beating three Primals, farming 900 myth tomes, 12 atmas and 75 alexandrites and melding a random set of materia, I finally have my Thyrus Novus for my White Mage!
I mostly got the alexandrites via doing the daily quest, getting others using myth tomes and than getting a few via fates (was quite lucky with that). For those that remembered me saying I could finally put the stats I wanted on it … I kinda did. I maxed out on Piety but had to then go half Spell Speed and Determination.
Due to the massive cost for Detemination materia I decided to just put enough on that it would be better than every stat on the Yagrush.
Regardless I am happy and it is all done and now its ready for the next stage