Resources

http://www.ragingswan.com/free-resources/

https://geekdad.com/2014/12/5e-dungeon-masters-guide-1/

http://io9.gizmodo.com/the-new-dungeon-masters-guide-is-like-a-hackers-manual-1670551012

http://theangrygm.com/monster-building-101-its-alive-its-alive/

http://www.runagame.net/2013/08/4e-skill-challenge-example.html?m=1