Harmonquest is an animated Pathfinder game session (Pathfinder is basically Dungeons and Dragons, don't worry about it). Dan Harmon, the creator/co-creator of Community and Ricky & Morty, and a bunch of pals play the game, with some of their actions given animated life thanks to the animation team behind Rick & Morty. There is a regular group of gamers and also a special guest spot which rotates every episode. The first episode is very funny.
The other nine episodes can be watched through NBC's streaming service SeeSo if you're in the United States. If you're not then, er, tough luck right now, but apparently an international viewing solution is in the works. If the rest of the season is as good as the first ep (and according to reviews, it is) then it should be worth the wait.