Harrowing

The Harrowing is an event to commemorate Halloween festivities in the world of League of Legends. It will introduce a few changes to the game (items, maps), that will most probably be reverted after the celebration ends. Also some Champion Skins and Some Runes will be available for sale. The event will occur from October 18, culminating in October 31 of 2010.

Lore
Each calendar year, the celestial bodies of Runeterra align in a particular astronomical event. This lengthy occasion -- beginning with a partial eclipse on the 18th of October and culminating in a full solar eclipse on the 31st of October -- is of one of the most significant holidays in Valoran. The alignment occurs annually around the time of the harvest, and is known as the Harrowing due to its dusky setting. For obvious reasons, the occasion is marked by superstitions surrounding the world's dark denizens, creepy crawlies, and things that generally go bump in the night.

While rural folks still believe that this is a time of great foreboding, most of Valoran has taken to commemorating the Harrowing through a bit of good, clean fun. Citizens of the city-states don monstrous costumes and exchange holiday sweets with one another as part of the revelry. Large costume parties, where patrons wear either light or dark costumes (with the intention of either warding off or confusing evil) are quite popular, and those of opposite colors are encouraged to exchange gifts with one another. However they're celebrating, all across Valoran, spirits are as high as the night is long.

As with all things Runeterran, the League is a major participant in the holiday festivities. Summoner's Rift is decked out with special lanterns to provide lighting (and a bit of atmosphere) during any scrimmages that take place during the eclipse. Minions are also decked out to honor the occasion, and even some champions choose to join in the merrymaking, donning costumes before they take to the battlefield. Additionally, the alchemists of the Institute of War brew special holiday concoctions, and the rune forges produce special runes for summoners who display valor during this time.