1. Download & Install the 1.12.1 Client
https://mega.nz/#!blI1hBjb
(Fully Installed Client w/ updated realmlist, just run WoW.exe)
Decryption Key: !mNhhc8cJ_ZROqirneKGvwXeO5dOABYxIdCvVzAbRwdQ

2. Change contents of realmlist.wtf to:
(use Notepad to open & save the file, located in your c:/Program FIles/World of Warcraft folder)
Do not use the launcher to start the realm. Open with WoW.exe

set realmlist logon.thealixium.com