Novus weapon upgrade system findings

[Arrak]

From what I've heard it works in tiers. Once you put in enough 1s, you head to 2s, then 3s and 4s. If someone else could elaborate and/or correct me if I'm wrong I'm curious as well.

That's how it works. The number needed for each tier is different depending on the stat and whether or not its normal weapon, Curtana, or Holy Shield.