So, you want S-Off on your One X/L, or Droid DNA? Done and done. Thanks to a crafty new "hack" by jcase and beaups, S-Off can easily be yours. As always, however there are a few pre-requisites, as well as some caveats to be aware of.
Firstly, you must have working adb and fastboot. If you don't know what that is, a quick Google search can answer it, and tell you how to get it. Your device must also be rooted and have SuperCID, no exceptions. This is requisite.