Who developed the game which Folkenstal features weapons and armors in a cosplay? 
Folkenstal: Folkenstal from Switzerland, a Cosplay artist, highlighting the weapons and armors from the latest MMORPG, The Elder Scrolls Online. The Elder Scrolls Online: The Elder Scrolls Online is a massively multiplayer online role-playing (MMORPG) video game developed by ZeniMax Online Studios and published by Bethesda Softworks.
ZeniMax Online Studios