With all of the polycount Dota2 entries I can't find the discussion thread for Dota 2, so sorry for the duplicate. Check out the Halloween Diretide Mode. You have to feed Roshan candy. Looks soo cool! More Valve awesomeness.
You can see the game at 5:30 mark.
2 Diretide Game Mode (Gameplay w/ Reaves) - YouTube[/ame]