We have had Root on devices like the Honor 5X for some time now, but getting a working version of the Xposed Framework on the device has been elusive. Today the developer working on the project has announced that it is fully functional on Honor devices running EMUI 3.1 and 4.0!
Before now it has worked but has been quite buggy.
Installing this will require a bit of experience. Actually it will require above average experience as you will need to deodex your rom, merge the deodexed changes to your device and then finally install the Xposed Framework. If you are willing to go through the trouble head to the link below for the full guide.
via XDA