Old script used for the old Sombra ARG that blizzard did

skull-1.txt

                          :PB@Bk:
                      ,jB@@B@B@B@BBL.
                   7G@B@B@BMMMMMB@B@B@Nr
               :kB@B@@@MMOMOMOMOMMMM@B@B@B1,
           :5@B@B@B@BBMMOMOMOMOMOMOMM@@@B@B@BBu.
        70@@@B@B@B@BXBBOMOMOMOMOMOMMBMPB@B@B@B@B@Nr
      G@@@BJ iB@B@@  OBMOMOMOMOMOMOM@2  B@B@B. EB@B@S
      @@BM@GJBU.  iSuB@OMOMOMOMOMOMM@OU1:  .kBLM@M@B@
      B@MMB@B       7@BBMMOMOMOMOMOBB@:       B@BMM@B
      @@@B@B         7@@@MMOMOMOMM@B@:         @@B@B@
      @@OLB.          BNB@MMOMOMM@BEB          rBjM@B
      @@  @           M  OBOMOMM@q  M          .@  @@
      @@OvB           B:u@MMOMOMMBJiB          .BvM@B
      @B@B@J         0@B@MMOMOMOMB@B@u         q@@@B@
      B@MBB@v       G@@BMMMMMMMMMMMBB@5       F@BMM@B
      @BBM@BPNi   LMEB@OMMMM@B@MMOMM@BZM7   rEqB@MBB@
      B@@@BM  B@B@B  qBMOMB@B@B@BMOMBL  B@B@B  @B@B@M
       J@@@@PB@B@B@B7G@OMBB.   ,@MMM@qLB@B@@@BqB@BBv
          iGB@,i0@M@B@MMO@E  :  M@OMM@@@B@Pii@@N:
             .   B@M@B@MMM@B@B@B@MMM@@@M@B
                 @B@B.i@MBB@B@B@@BM@::B@B@
                 B@@@ .B@B.:@B@ :B@B  @B@O
                   :0 r@B@  B@@ .@B@: P:
                       vMB :@B@ :BO7
                           ,B@B

skull-2.txt

                          :PBBk:
                      ,jBˆ@B@B@B@BBL.
                   7G–B“B•BMMMMMB@B@B@Nr
               :kB’Bˆ—MMOMOMOMOMMMMŒB˜B@B1,
           :5‘BB˜BˆBBMMOMOMOMOMOMOMMŠ’nBnB@BBu.
        70n†•BˆB’B”BXBBOMOMOMOMOMOMMBMPB˜BˆB@B@B@Nr
      G˜–—BJ iBˆB‡ˆ  OBMOMOMOMOMOMOM–2  BB@B. EB@B@S
      ’–BM‡GJBU.  iSuBˆOMOMOMOMOMOMM—OU1:  .kBLMˆM†B—
      BŒMMB™B       7ˆBBMMOMOMOMOMOBB–:       B‡BMMˆB
      ˜ˆBŠB         7’–@MMOMOMOMM@B@:         @@B@B@
      ’OLB.          BNBMMOMOMMBEB          rBjM„B
      @  @           M  OBOMOMM@q  M          .@  @@
      „•OvB           B:uŒMMOMOMMBJiB          .BvM@B
      „B‘B˜J         0‘B—MMOMOMOMB•B@u         q@@@B@
      B„MBBŒv       G‹BMMMMMMMMMMMBBˆ5       F„BMM@B
      ‡BBMBPNi   LMEB…OMMMMBƒMMOMMŠBZM7   rEqB‡MBB„
      B˜–„BM  BmB„B  qBMOMBB…B„BMOMBL  B@B@B  @B@B@M
       J–m†„PBB„B™B7GˆOMBB.   ,@MMM@qLB@B@@@BqB@BBv
          iGB•,i0„M–BnMMO‹E  :  M@OMM@@@B@Pii@@N:
             .   B—MBMMM@B@B@B@MMM@@@M@B
                 @B@B.i@MBB@B@B@@BM@::B@B@
                 B@@@ .B@B.:@B@ :B@B  @B@O
                   :0 r@B@  B@@ .@B@: P:
                       vMB :@B@ :BO7
                           ,B@B

sombra_arg.py

#!/usr/bin/env python
from sys import version_info, exit

def getDiff(original: str, moshed: str) -> str: 
    diff = ""

    if verbose:
        print(f"Original length: {len(original)}\nMoshed length: {len(moshed)}")

    # iterates through both files and compare character
    for i in range(min(len(original), len(moshed))):
        org = original[i]
        mosh = moshed[i]
        
        # If characters on the same position don't match
        if org != mosh:
            # Subtract their charcode's to get the real character
            true_value = ord(mosh) - ord(org)
            diff += chr(true_value)
            if verbose:
                print(f"char[{i}]: skull-1({ord(org)} = {org}) AND skull-2({ord(mosh)} = {mosh})\n" +\
                      f"{ord(mosh)} - {ord(org)} = {true_value} = {chr(true_value)}")

    print(f"\nExtracted: {diff}")
    return diff

def caeserChiper(plaintext: str, mod: int) -> str: 
    deciphered = "" 

    # https://en.wikipedia.org/wiki/Caesar_cipher#Example
    # f(x) = (x + k) (mod)
    for i in range(len(plaintext)): 
        char = plaintext[i] 
        
        if (char.isupper()): 
            deciphered += chr((ord(char) - 65 + mod) % 26 + 65) 
        elif (char.islower()): 
            deciphered += chr((ord(char) - 97 + mod) % 26 + 97) 
        else: 
            deciphered += char

    print(f"\nDeciphered: {deciphered}\n")
    return deciphered 

if __name__ == "__main__":
    if version_info <= (3,6):
        exit("Use python3.6+ or fix the f-strings")

    verbose = True
    skull1 = open("skull-1.txt").read()
    skull2 = open("skull-2.txt").read()
    
    # 23 = the mod used for Caeser's cipher
    decrypted = caeserChiper(getDiff(skull1, skull2), 23).split("?")
    print(f"Noteworthy: {decrypted[1]}")