This is a Cyclopedia Bestiary Entry from Pillars of Eternity

Monster Name: Death Guard

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Extraordinarily rare, death guards are sometimes created upon the demise of a particularly determined individual who refuses to leave the physical world for the Beyond. Paladins are the most common subjects for this terrible transformation, but priests and other exceptional zealots often suffer the same fate. Death guards occupy their former bodies, but the energy that allows the soul to remain in the physical world rapidly consumes the flesh, leaving only bone behind. Death guards are often driven mad by their state. They are terrifying foes to behold, striking fear into those who stand before them. Their limited connection to the Beyond allows them to summon fearsome balls of flame, summon shadows, and even slay the living with a word.