You need a total of 650 Pyros crystals for upgrading elemental weapon into Pyros weapon, which not a lot of drop from NMs if they spawn, and it's the only way to get these crystals, same with Pagos and Anemos crystals.

However, Anemos Crystals had more uses and were required to complete armor AND weapon set for your job that you wanted to get geared up for, and could be converted into protean crystals and NMs gave Anemos crystals like it was candy, and you also need to kill Pazuzu once.

Pagos crystals that were required for elemental weapon is 500 and far as how many dropped for how unfun Pagos was at the start until people learned that it was better to do challenge log in Anemos to actually do Pagos grind at lvl 25, that was fine although, need to kill Louhi 3 times was a bit too much, and same goes for the light farming...

Pyros has no excuse whatsoever for the absurdly low amount crystals that drop from NMs, especially since there is no there is no other way to get these items, Pagos wasn't as bad because you didn't need that additional 150(200+ if you farmed Louhi 5 times along with whatever NMs you doing for light farming) and people have already found the most optimal way for grinding out the random stats for their Pyros weapons, except for those that are so far behind because of Pagos not being fun and are expecting for NM trains to be a thing in Pyros. And that's not even factoring in how dumb NM spawn rates are and the conditions...


So overall Pagos needs light farming to be easier, and Pyros NMs need to give more crystals..