There are two new champion skins that can be tried out during the event and purchased to keep afterward: a Haunted Zyra and Officer Vi. Riot Games is also bringing back legacy Harrowing skins for a limited time for those who missed them in previous years.
Players can choose to spend their RP to send a mystery gift in the form of a random skin to a friend. This mystery gifting will result in a skin that's worth more RP than what it cost to buy, perhaps to encourage friends to gift to each other. The team's also added five summoner's icons that can be earned during the event.
The Harrowing will continue through November 12th.