Spirit Mask

The Spirit Mask is a  Helmet that is acquired through the Dark Auction. As of the release of Catacombs - Floor 4, the Spirit Mask is now a Dungeons item.

Acquiring
Occasionally, the Spirit Mask will be one of the items present at the Dark Auction. The player must outbid all other players in the lobby to acquire the mask. Prices may vary depending on the lobby and time the auction takes place at.

Tips
The Spirit Mask can be used as a helmet to the Elegant Tuxedo set to keep players from getting one-shot by mobs.

The Spirit Mask's ability is superior to that of the Bonzo's Mask in cooldown time and in that it can be used outside of the Catacombs. However, it has lower stats than Bonzo's Mask.

Trivia
The texture used for the spirit mask resembles Kindred from the game League of Legends. There was also a leaked helmet called the Kindred which gave 70% Speed.

The ability also seems to have a portion of Kindred's ultimate ability, which prevents users from dying. However, unlike the ability in League of Legends, Spirit Mask doesn't heal you when the effect resolves.