From PathfinderWiki
Septisaeus is on the far right.

The white apocalypse horse Septisaeus is the mount of Apollyon the Horseman of Pestilence. This advanced nightmare bears a golden crown marked with its master's symbol and a neck punctured by a dozen barbed arrows. Septisaeus seems healthy at first glance, but upon closer inspection bears the signs of horrific infections: sclera black with ocular bleeding, cracked gums and teeth, a frothing mouth, and purpuric blemishes marring its extremities.[1]


  1. Amber Stewart. (2011). Horsemen of the Apocalypse, p. 8. Paizo Publishing, LLC. ISBN 978-1-60125-373-6