I have my zenith, i'm about to start farming atma, then books, but thing I would like to know is, if I get to say the alex part do I need to finish all 75 alex for weapon I started on before I can get another weapon and do alex? Or say if I started as War did 10, leveled my Pld up and liked it more, would I have to finish all 75 on war or does it not matter and i would be fine on pld relic once I get to that point?

Thanks for any info