Fanatiker der Tiefe (Civ4 FFH)
The Zealot can be sacrificed to add either 20 culture to a city. Note that this unit never expires.
The Zealot substitutes for a missionary (from vanilla Civ IV) of the Octopus Overlords. Like missionaries, it can be sacrificed to spread its religion. Unlike missionaries, zealots can also be used for other purposes, including saving a city with very little culture (or at least buying it a few turns), acting as a healer for a stack of units, or even as a weak military unit. Also unlike the Missionary, it can be upgraded.
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The Zealot starts with the Medic I and Dwarf Slaying promotions, and can be sacrificed to add either 20 culture to a city or to convert it to Octopus Overlords. They can be upgraded to either a Cultist or a Stygian Guard.