Dark Young (黒い仔山羊, Kuroi Koyagi) are over level 90 monsters summoned from the spell "Iä Shub-Niggurath", a powerful super-tier spell. It was one of the most popular spells used back in YGGDRASIL.
Said to be ten meters tall, the Dark Young are looked upon as horrifying, pitch-black monstrosities, seemingly made of ropy black tentacles with drooling mouths covering their bodies.
Moreover, the Dark Young are described as having iron-like muscles covered in tough rubbery skin. Not even Gazef Stronoff, using one of the Re-Estize Kingdom's five treasures; Razor Edge, was able to harm them in the slightest. Their roots have been turned into a lump of flesh.
Contrary to the Dark Young's nightmarish appearance, they can make adorable goat bleats. Sprouting underneath their bodies are five hoofed legs that look like those of a goat.
The Dark Young are considered to be a extremely powerful and highly intelligent monster. It is able to cause fear and insanity in the humans around them. The creatures' horrific appearance and size was just enough to make the Kingdom's soldiers experience unimaginable anxiety, notably even making Gazef Stronoff feel the urge to turn around and run. Although these monsters do not have any powerful special abilities, they were outstandingly resilient. They are capable of moving at great speeds and outrunning even warhorses.
- The Dark Young are based on H. P. Lovecraft's Cthulhu Mythos' Outer God Shub-Niggurath's children. The Dark Young act as proxies for Shub-Niggurath in the accepting of sacrifices and spreading of their mother's faith across the world.
- Under normal circumstances, every summoning of the Dark Young would only produce one entity, which was itself a cause for celebration to players. While being able to bring out two of them was considered a rarity, Ainz broke the record by managing to summon five Dark Young, which is the highest number known so far. However, the Dark Young would eventually disappear after a set amount of time passes.
- According to Princess Renner, the total amount of casualties caused by the spell during the Katze Plains Massacre was over 180,000 deaths.
- When Gazef used two Martial Arts, 'Sense Weakness' and 'Possibility Sense', he came to learn that his slim chances of obtaining victory over the Dark Young are impossible as well as being unable to detect any weaknesses from it. It is unknown whether the Dark Young truly had no weaknesses, or any which appeared could not be seen because of the overwhelming difference in strength.