In Pathfinder #18's "Descent into Midnight," the heroes travel deep into the Darklands, into the nightmare realm of Orv. There, in an immense cavern known as the Land of Black Blood, the final enemy awaits. This volume of Pathfinder includes a short gazetteer about the Land of Black Blood that details the numerous strange locations therein and several of the region's dangerous denizens, like the aboleth pictured here.
But there are also less intimidating (but no less creepy) denizens of the Land of Black Blood than monsters ready to challenge a high-level party. Numerous rare and unique creatures make their home here as well, most warped from more common forms by ages of exposure to the vault's strange magics and the deadly black blood.
Ghost Bats: The pale bats native to the Land of Black Blood typically sate themselves upon large insects and other vermin, though in their swarms they have been known to attack larger prey. Possessing transparent wings and no hair—just white flesh—these small hunters sometimes grow to shocking sizes. Ghosts bats have the same stats as normal bats and bat swarms, though the species frequent mutants might grow to the size of dire bats.
Ether Frog: These creatures look like nothing more so than an oversized, four-legged blister with nostrils and a mouth. With an undifferentiated body and head, these ghost-white amphibians hide a single overdeveloped parietal eye beneath their bulbous backs, which grants them darkvision out to 60 feet despite their lack of normal eyes. Most creatures avoid the frogs, knowing of their natural poison—Ingested, Fortitude DC 14, initial and secondary damage 1d4 Dexterity. In all other ways they are simply largish frogs with the same statistics as common toads.
Stirge Hounds: These rare, unnaturally large stirges are often used as tracking animals, capable of following flying creatures through the Darklands. Stirge Hounds have the statistics of a stirge advanced to Small size and 4 Hit Dice. They are very aggressive and prone to hunting in packs or even swarms. Their proboscis is uniformly ivory-colored, while their bodies are usually dark rust-red along the wings fading to black upon the body.