Cocoon

Cocoon is a vessel found in Shin Megami Tensei IV.

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An ark built by the Angels in Shinjuku's National Park more than 25 years ago, where they took the kidnapped children across Tokyo who were chosen for the "new millennium". The inside resemble a beehive. It left for the sky before the ceiling was created 25 years ago and eventually landed in a area of land that would eventually be known as Shene Duque. The Cocoon disappeared afterwards and none of the people of the Eastern Kingdom of Mikado knew what became of it. The Cocoon returns during the time when the prentice Samurai are trying to hunt down Yuriko and learned of the "true evil" found in Tayama's territory in Reverse Hills, and it is from here that the new leaders of Mikado rule: Heralds Michael, Raphael, Gabriel, and Uriel.

In Blasted Tokyo the Cocoon was able to head into the sky before God's Wrath descended up on the world and returns at the end of the DLC involving the battle against Ancient Day. In Infernal Tokyo the Cocoon was unable to head into the sky as the still human Kenji and his comrades killed the Angels. However, it took too long for them to dig into the Cocoon to rescue the children and by the time they had gotten them out the children had rotted away. It still remains in Shinjuku National Park where it was built.