Among the greater agons’ intangible domains of dread, the sombragon is the titular fiend of darkness. Few have seen its true physical form since it is always shrouded by darkness, even among those with darkvision.
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The sombragon was designed to fully embody the fear of utter darkness and create a challenge for players whose usual strategy is to "just hit things until they die." How do you pronounce this monster? It's either SOM-bra-gone or som-BRAH-gun but it's up to you tbh
The sombragon, one of the monsters from the Across the Furnal Bridge compendium (Preview | Compendium). The compendium also has exclusive stat blocks for the 3 archfiends of the Furnal Planes — the terrifying archagon Abalaroch, the overwhelming archdevil Herzinan, and the sadistic archdemon Karvaxos.