Rustbolt Resistance is a neutral faction added in the 8.2 Battle For Azeroth patch. By improving your reputation with this faction, you can gain a number of unique rewards: a riding animal, essences that will allow you to strengthen Heart of Azeroth, and blueprints to create special items that will be useful in adventures on Mechagon. Honouring with the Rustbolt Resistance is one of the conditions of the Battle for Azeroth Part 2 meta achievement Pioneer, necessary to unlock flights in Kul'Tyras, Zandalar and in the new zones added in patch 8.2: Mechagon and Nazzhatar.
Not sure what you need to do to complete Battle for Azeroth Part 2?
Go to wowhead.com/flying, click "Load Character", enter all the details, and see what achievements are left to gain!
After achieving the Exaltation, you can still improve your reputation with the Rustbolt Resistance. By becoming an Ideal for this faction, for every 10,000 reputation points you receive, you will receive Rustybolt supplies. Inside the chest you will find Azerite, and a variety of random items. Notable among them are the Superpowered Purification Protocol, the Null Power Visualizer, and the Existence Saturation Display, a rank 4 essence. You can also get the Blueprint: microbot xD and Blueprint: Rustbot resistance insignia, which are needed to achieve the Artisan Architect.
After completing the introductory quest chain on Mechagon, you will be introduced to one of the first components: blueprints. Blueprints are special circuits that you will obtain by completing quests and killing rare creatures on Mechagon. When you improve your reputation with the Rustbolt Resistance, the Stolen Royal Merchant will start selling you new blueprints. Pascal-K0R0L6 can use them to create items for you such as: ZHRST Box, Laser Pointer for the Mechanocat, Protocol Redirector, and High Tech Enhancement for Adventurers.
One of Mechagon's most important resources is the Galvanic Oscillator. Oscillators are a major component of many of Mechagon's artisanal mechanics projects. When you open local quests on Mechagon, you can get an oscillator as a reward for one of them every day.
The pocket computing device is an unusual accessory added in patch 8.2. You will receive it when you complete the opening quest chain on Mechagon and complete the First Instance for free. Unlike the other accessories the computing device can be modified and upgraded using the so called punch cards. They come in three varieties: yellow, red and blue, and each punch card expands the capabilities of your computing device. Keep in mind, though, that you can't insert two of the same color punchcard at the same time. To get new punchcards, you will have to kill rare creatures on Mechagon, defeat bosses in the Operation Mechagon dungeon, or buy punchcards from the Stolen Royal Merchant.
Spare parts are the most common component on Mechagon. You will obtain them by killing mechanical creatures and completing daily tasks on Mechagon. Spare parts are needed to repair the various mechanical devices scattered throughout Mechagon, but that's not their only purpose. Pascal-K0R0L6 can turn 250 parts into a Box of "HHHST", which comes in handy for a variety of artisanal mechanics projects. To turn the crate back into spare parts, locate it in your inventory and right-click on it.
How to Upgrade Reputation
To start improving your reputation with this faction, you'll need to unlock access to local and daily quests on Mechagon; to do so, go through the opening quest chain before Welcome to the Resistance. In addition to the quests, you will receive reputation for the first kill of each of the rare creatures, as well as for the quest items you can gain by defeating the local pet battles.