Featherine

https://www.twitch.tv/niisam/clip/PuzzledVivaciousCamelNerfBlueBlaster?filter=clips&range=7d&sort=time "fM iS bAD, buFF uS plZ"

Yeah it's nice, except when you meet people that queue at the same time and then team up.

To use the voucher on an existing character you have to log on said character, press Escape to bring up all the F1234... options like Dungeon/Arena whatever and there's the voucher icon in there, click on it and go through the process.