With only one day before the actual holiday itself comes the Halloween Update for Dota 2. Included are a new game mode called Diretide, Eggs and cosmetic items. Along with the update came a new cinematic for the event, made completely in Source Filmmaker. Check it out here.
Diretide is a new game mode in which players run around the map collecting candy, until Roshan breaks from his enchantment and makes chase. When Roshan is killed he drops both Essences and eggs. Essences are used on eggs to make them hatch couriers, and it seems that various combinations or a higher amount of Essences will breed an exceedingly rarer courier.
Happy Roshan hunting and be sure to share with the community what the best Essence combinations are! You can read the entire update news here.