It's a little more nuanced than that, since not all skills are equal in value, and some skills are heavily influenced by its skill size while others are not. Here is a very very rough approach I use for quick screening (and I'm sure ppl will disagree, but whatever, I will shoot my own rules down in this post anyway):
- For every assault or pride, count that as 1.5 skills
- Exceed counts as 1 skill
- Defender counts as 1 skill if the weapon also has assault or pride, count as 0 skill otherwise
- Vigoras counts as 1 skill if the weapon also has assault or pride, count as 0 skill otherwise
- Rush and barrage count as 0.5 skill each if they are size (+) or better, 0 skill otherwise
- Ascension counts as 1 skill if you use healers, 0 otherwise
- Stinger and elaborate count as 0 skill
If the sum of the above rules give you 3 or greater, it is worth keeping the dupes.
Now, in practice, it's not nearly as simple as that. Let me walk you through some light hime weapons to illustrate why all those rules can be broken depending on your situation:
- Mike lance, on FLB it becomes assault (++), defender (+) - only two skills and only add up to 2.5 skills using my rule above, so, trash right? That would be a mistake - there are no event FLB light lances to date, not even on DMM, so if you want a light lance grid, Mike's lance is proabbly the 2nd best lance there is (1st is Tish lance - assault (+), exceed (+), ascension ())
- Longinus lance (from draonic eye shop), on FLB it becomes assault (++), rush (+) - worth only 2 skills, worse than Mike's lance. Again, due to lack of good light lances, Longinus is often used for light lance grids 'cos if you've been playing for a while, it's actually feasible to spend 15 draconic eyes to get one of these - your alternatives are spending a mtix for a dupe weapon or whale hard for Tish and Mike lances
- Atum axe, on FLB it becomes defender (++), assault (), ascension () - worth 3.5 skills if I use healer, so keep the dupe right? Well, it's not a bad axe, but if you've been playing for a long time, you may have 3 UE axes after the next phantom UE. Add in Herc's axe, you have your 5 axes for axe grid already. Axe grid isn't exactly meta for light 'cos only Atum is an axe user and she's not an offensive hime (lance and glaive grids are popular 'cos most offensive light himes use lance or glaives.) Also, if you go full glass cannon and drop your healer, the axe is not as valuable, so the dupe may or may not be all that useful depending on what else you have and your play style.
- Metatron hammer, on FLB it becomes defender (++), exceed (+) - worth 1 point, fodder material right? Again, that would be a mistake. Her hammer refunds you 20 BG on burst, which is very valuable for light teams. This is why some ppl apparently use Metatron hammer on Hektor (T4 Sieg). The improved burst speed offsets the lack of assault on the weapon. For this use, you actually don't need to keep the dupe, just LB it - my point is just don't fodder it.
So, as you can see, there're situations to break pretty much any rules I can come up with.
tl;dr - just keep the dupes if you're not sure.





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