Radiant Priest
Radiant Priest in the Stellaris encyclopedia: Radiant Priests replace Politicians on planets with Habitability lower than 50%. They turn Consumer Goods into Unity and Amenities.
Radiant Priest in the game's words
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Radiant Priests replace 
Politicians on planets with Habitability lower than 50%. They turn Consumer Goods into 
Unity and Amenities.
To keep burning the flames of faith, this society's ruling priesthood embodies the radiant light of holy fire, lighting the way for their followers and cleansing evil from society.
Source: common/game_concepts (concept_inf_radiant_priest, also concept_inf_radiant_priests) and localisation/english, Stellaris Cygnus v4.5.2 (9776).