In the summer of 2009, I worked with ArenaNet's Audio department to build out their Sound Library. My primary responsibilities included location scouting, field recording and audio editing. I worked closely with their Audio Integrator and Lead Sound Designer on developing content that could fit seamlessly into the existing implementation systems for Guild Wars 2.
Oh yeah, and Guild Wars 2 is free to download. Enjoy!
https://welcome.guildwars2.com/en/Play-For-Free