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The First Descendant has this peculiar mechanic that sounds pretty cool “on paper”. Unfortunately, in practice, the results are quite opposite. For Rare (purple) and Ultimate (Gold) Reactors, you need to have a certain weapon to receive a boost in your Skill power.
Rare Reactors are a bit simpler to use since they require you only to have the weapon equipped, ie, as one of the three weapons you selected to use. Ultimate Reactors offer a better Skill Power boost (160%, instead of the 140% boost Rare Reactors have) but they require you to use a specific Ultimate Weapon at that moment to grant you that boost. As players usually switch weapons during a mission/boss battle, this turned out to be frustrating. Your Skills are more powerful when wielding, for example, Thunder Cage, but less powerful when you switch to your Sniper. Unsurprisingly, the players voiced their dissatisfaction numerous times, hoping that Nexon would do something about it.
Improvements to Weapon Mountings
On September 26, Nexon published a new Dev Note #14, where they previewed some of the major updates coming to TFD on October 10. With all the talks of Ultimate Freyna, the new Colossus, and harder Invasions, it was easy to miss a few paragraphs concerning Ultimate Reactors and Weapon Mountings.
“We also want to address the issue of Reactor farming. To reduce the inconvenience of having to farm a new Ultimate Reactor every time you switch to a new weapon, we’re introducing the Reactor Implant system.
This system will allow you to implant the Weapon Optimization Conditions of other Ultimate Reactors to your current Ultimate Reactor. An Ultimate Reactor can have up to three Weapon Optimization Conditions, and you can freely implant Weapon Optimization Conditions based on your weapon settings.
With this, you’ll no longer have to farm a new Reactor each time you switch your weapons, as you only need to implant a new Weapon Optimization Condition into the Reactor you’re currently using.”
With this system, it looks like you can “add” weapon mountings from other Ultimate Reactors to the one you’re using, and it can hold up to three different weapon mountings, so it can encompass all the weapons you currently have equipped.
Unfortunately, we have no other info on this (like if there is a price to this or not, either in Caliber, Gold, or materials), but even now it sounds pretty cool, and once again proves that Nexon does listen to its community.