Cocoon

Description
a cocoon in iron marines is a large, bulbous, transluscent bubble. It contains a fell boss or mini-boss.

Types

 * fell bishop (contains a bishop)
 * fell tyrant (contains a fell tyrant. The tyrant will die if the cocoon is broken.)

questionable types (may not actually be cocoon)

 * human/mindbane (releases mindbane or human)
 * empyrean (releases unit of guardians)