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InThe First Descendant, players can unlock the best Launcher in the game, called the Vestigial Organ, without doing a lot of research. Research can allow you to unlock various characters and weapons, but being able to get this Launcherwithout having to spend tons of materials on researchmakes it better. This Launcher can propel players into the endgame and easily stay with them until the end.
Whiledifferent characters inThe First Descendantwill favor different weapons, the Launcher is more of a secondary weapon that can dealmassive damage when needed. However, it can easily replace a main weapon with the right build. Out of all the Descendants, the Vestigial Organwill favor Gley the most.

The Best Ajax Build In The First Descendant (Weapons, Module, & Skills)
If you picked Ajax at the start of The First Descendant, this is the best build to make him strong on the battlefield and a big help to your team.
Farming The Vestigial Organ
The Agna Desert
There is no researching this weapon with Anais or hoping to find this weapon out in the wild like you can with other weapons. The Vestigial Organ mustbe found by completing the “Miragestone: Vulgus Strategic Outpost Zone ReconMission"or the “Previous Construct Team Quarters Battlefield"Missionwithin the Agna Desert region. In Normal mode, you have about a30% chance of getting this weapon droppedupon completing the mission as one of your rewards.
However, if you are up to the task and want a slightly higher chance of success, you can try themission on Hard mode and instead have a 50% chance of getting the reward. You can try it as many times as you want, but the mission is on a timer, so you will have to keep an eye on the event to knowwhen it opens and closesso you can continue to give it a go. You may have more success if youcomplete the mission with friends inThe First Descendant.

If you have not unlocked the Agna Desert yet, it is likely because you have not completed the main campaign to the point where it is unlocked. It is the5th region you will unlock, and you will want to be aroundLevel 40before you travel to this region.
Vestigial Organ Stats & Best Rolls
Base Level & What To Look For
You will want to look for how to make the Vestigial Organ the best possible Launcher for you and your character to beat everyboss inThe First Descendant. However, no matter what other traits your weapon acquires, you will always start with thesame base stats at Level 1.
182

4
33%
4.2s
268
Rate of Fire
199
You can continue leveling your Vestigial Organ up, but you will need toreach Mastery Rank 3 to access the Weapon Level Transmission. This is located at the Repair Station Workbench, where you can view the requirements to level up your new weapon. You will need50 Superalloy, 2500 gold, and 2:30 of research time to do so the first time. It is worth improving those stats, so prioritize it if possible.
However, your weapon will come withcertain traits that you can re-roll. It is possible to lock in one and continue to re-roll others so you can customize your weapon to your liking. The suggested roles to look for are:
You can re-roll your weapon’s traits in theWeapon Readjustment menu.
This is because there isno Critical Hit Rate mod or rollthat will help this weapon improve, as that is not the focus of this weapon. Instead, you are looking for big damage and elemental attributes. With that in mind, here are some suggested Modules to add to your Vestigial Organ, as suggested byNothingButSkillz:
In this case, theFire Enhancement can be swapped out for whatever Elementyou are trying to prioritize the most. For instance, aBunny Build inThe First Descendantwould prioritize electric damage. Figure out which works best for you and your Descendant, and you will have a very powerful weapon.
You can continue trying to farm the Vestigial Weapon as you advance through the game.At Level 100, you can farm it again and end up with a much more powerful version. You can transfer any Modules you want to it and have a new one with old materials ready to be incorporated. And that is all you need to know about the Vestigial Organ inThe First Descendant.