Clamour is an unofficial Discord app for Windows 10 Mobile. The official app development team have yet to release an official app, so this is a handy app for those who rely on the platform and use Microsoft's mobile OS. At the time of writing, Clamour supports messaging, but no voice as-of-yet — though this is reportedly in the works.
The app will enable you to join all your connected servers and even engage in private conversations. Basic functionality is there, and all we need now is support for voice to really make this a compelling solution to Discord on Windows 10 Mobile. Give the app a try by downloading it from the Windows Store for $1.99.
Thanks aurelink for the tip!