The 4-seal items are also trade-able, so if you have gil, you can just buy them from the Marketboard.
If you're a hunt train follower, you tend to swim in currencies that can be used for anima weapon. For allegory and nuts, they can be turned into gear for GC seals.
Really wish they nerf Eureka weapon to not be NM train dependent, similar to how the first area of Eureka works with two currencies.
