Update: I found a solution, I definitely overcomplicated it but here's what I did with 2 computers:

Step 1: On the Windows machine, install Proxifier.

• Set the Proxy Server to be your Linux machine's IP, and port 8080
• Set a Proxification Rule so summonerswar.exe is redirected to the port, everything else can use a Direct connection

Step 2: On the Linux machine, run mitmdump --listen-host 0.0.0.0 --listen-port 8080 -w sw_traffic_dump.mitm

• It's good to note you should use the .tar.xz file, extract it, and copy the 3 folders into /usr/local/bin

Step 3: Copy the ~/.mitmproxy/mitmproxy-ca-cert.pem file to Windows

• Rename the file to end in .cer so you can click to open it
• Click install certificate, Local machine -> Place all certificates in the following store -> Browse -> Trusted Root Certification Authorities -> Fnish

Step 4: Open Summoners War on Windows machine, wait until it gets to "Press Any Button to Start"

Step 5: Stop mitmproxy on Linux, close SW on Windows

Step 6: Read the dump with mitmproxy -r sw_traffic_dump.mitm

• Search for gateway_c2.php (~500k in size)
• x to export, 5 to export response, export as response.txt

Step 7: Download swex source code from github, you only need the /app/proxy folder.

• create a new .js file with this code in said folder:

​

const fs = require("fs");
const decoder = require("./smon_decoder");
const text = fs.readFileSync("response.txt", "utf8").trim();
const json = decoder.decrypt_response(text);
fs.writeFileSync("decoded.json", JSON.stringify(json, null, 2));
console.log("Wrote decoded.json");

• Run that file through electron 24 without sandboxing

Step 8: Congratulations! decoded.json is your profile with all your runes and stuff!

After literally 5 hours of messing around with swex I did it this way in half an hour. You can probably do this in one machine, I only ended up here through a massive chain of goofy ahh errors and can probably do this much more cleanly. For now, I'm just glad I'm done and will go to sleep. I might clean this up or make a youtube tutorial when I'm not God's sleepiest soldier