Final Fantasy XV A Better Pair of Plunderers is a side-quest you can complete by talking to Cid, if you want a new and more powerful set of daggers for Ignis or Noctis.
FFXV A Better Pair of Plunderers side-quest is quite easy to finish and very similar to A Better Absorb Shield, and A Better Valiant, because the weapon that must be upgraded can be acquired from Tony in Cape Caem.
Assuming you have progressed through the game’s story and reached Cape Caem, talk to Iris and ask her to show you how to grow Caem Carrots (Living off the Land side quest).
At the end of the said quest, a new NPC named Tony will be introduced and you will find out that he is very interested in vegetables. More specifically, Caem Carrots.
If you agree to grow more, he is willing to buy them from you and give you various items for them. One of these items is a Pair of Plunderers.
Be advised though, that the items you get from Tony are random, so you should start growing carrots as soon as you can, and keep trading with Tony until you get the daggers.
Objective: Find a Barbed Scythe for Cid
When you have the daggers in your possession, talk to Cid in Hammerhead, and you will be able to start A Better Pair of Plunderers side-quest, but as you probably guessed by now, you also need a specific item for Cid to turn them into Plunderers II.
In this case, you need a Barbed Scythe which is a FF XV material dropped by Killer Wasps.
While there are many locations where the Killer Wasps spawn, if you wish to complete this side quest faster, we suggest you to visit Malmalam Thicket in south-western Cleigne.
You can explore this dungeon anytime, but make sure you have several fire spells equipped. Additionally, when you fight Killer Wasps in FFXV, use daggers and spears for increased damage.
For each Killer Wasp defeated in battle you have a 75% chance to get a Barbed Scythe.
Objective: Give the Barbed Scythe to Cid
The moment you get a Barbed Scythe, go back to Hammerhead and talk to Cindy’s grandfather who will start working on your new pair of daggers.
Complete one hunting quest or one side-quest, then rest for one night to speed up the upgrading process.
In the morning, visit Cid and pick-up Plunderers II to end this quest.
A Better Pair of Plunderers Quest Info
Description: “A master mechanic, Cid can modify mechanized weapons to unleash their full potential. If Noctis can obtain a barbed scythe, Cid will upgrade the Plunderers – but he might take a while.”
Reward: Plunderers II x 1
Post Quest Suggestion
Complete A Better Force Stealer side-quest.