Here in 2018 any new app coming to Windows 10 mobile is a rare scenario if not, it is the most unlikely to happen. Then there is Quarrel UWP which brings Discord to Windows 10 mobile. Make no mistake, the app was earlier debuted on the PC, Xbox and even on the Hololense at the same time back in 2017.
Discord currently has over 135 million active users and growing like anything. The official app though surprisingly is still awaited. Obviously, you can grab the .exe file and install it on your PC!
A frequently updated Discord client for all Windows devices aimed to spread the usability of Discord to Mobile, Xbox, and HoloLens and non-Win32 tablets and PCs.
Unlike most of the third party experience in Windows 10 mobile, this one is pretty impressive by looks and usability, however, it is not as powerful as the official win32 app on the desktop for obvious reasons. You can get the Quarrel UWP app from here.