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Source: Princes of Darkness, pg(s). 16
The withered Blood Emperor Ruithvein is an infernal duke. The third vampire to come into being, he descended into the ranks of Hell's nobility. Now, some vampires make pacts with Ruithvein to protect their souls in the event of their destruction. Ruithvein shares the infernal kingdom of the Revenant Court in Malebolge with his fellow duke Lorcan, with whom he wages a subtle war for the souls of their vampiric worshipers.
- Wikipedia:Lord Ruthven (vampire) (fictional vampire)
- F. Wesley Schneider. (2009). Princes of Darkness, p. 16. Paizo Publishing, LLC. ISBN 978-1-60125-189-3
- Neil Spicer. (2011). Ashes at Dawn. Ashes at Dawn, p. Inside front cover. Paizo Publishing, LLC. ISBN 978-1-60125-312-5
- Tork Shaw. (2012). Blood of the Night, p. 25. Paizo Publishing, LLC. ISBN 978-1-60125-470-2