Question: Who developed the game which Folkenstal features weapons and armors in a cosplay? 

Related documents: [0]  [DOC] Folkenstal from Switzerland, a Cosplay artist, highlighting the weapons and armors from the latest MMORPG, The Elder Scrolls Online. [END] 
[1]  [DOC] The Elder Scrolls Online is a massively multiplayer online role-playing (MMORPG) video game developed by ZeniMax Online Studios and published by Bethesda Softworks. It was originally released for Microsoft Windows and OS X in April 2014. It is a part of "The Elder Scrolls" series, of which it is the first multiplayer installment. [END]  
Answer: ZeniMax Online Studios
ZeniMax Online Studios