Shroud of the Apocrea (Mission)

Shroud of the Apocrea is a Prestige Mission that became available with the 2013 Dark Harvest Festival. In the mission you enter a normal Clockworks Tunnel level with an undead theme. There is a party button after the first room and/or branches. Standing on it will bring up the gate behind you, but the gate in front of you will not open. The minimap will become staticky and then tentacles will come up out of the floor and kidnap you, ending the level. The next level is called Obsidian Nexus.