"The stunted dwarf-like Derro are
among the worst of the Inner Earth races. They crave magic, power and slaves."
https://burlingtonnews.net/derros.html
"These chaotic evil derro make raids on the surface to kidnap humans for use as slaves and food, and some among them, called Savants, possess magical and psychic powers they use to influence minds. The derro have strongholds deep underground in the Underdark, and it’s there where they plot the overthrow of surface-dwellers."
https://nerdsonearth.com/2021/09/dnd-lore-dero-derro/
"As twisted, dwarfish, shape-shifting, subterranean creatures who kidnap, torment, and breed with surface-dwellers"
https://www.yog-sothoth.com/wiki/index.php/Dero
"The dero are notorious for their sexual orgies"
https://occult-world.com/hollow-earth/
"Deros seem to be drawn to the heavily populated areas above as big cities are perfect hunting grounds. While the inhabitants of a large city can assist in its defense against an orc horde or other invading army, a large city's anonymity makes residents more vulnerable to the insidious threat of deros, who kidnap and abduct the unwitting without notice. Due to their incredibly secretive nature, most people do not know of the deros' existence, or simply believe them to be childish ghost stories"
https://pathfinderwiki.com/wiki/Dero
"To this day deros kidnap and torture surface humans, shoot airplanes out of the sky, and commit other evil acts."
https://science.howstuffworks.com/space/aliens-ufos/richard-sharpe-shaver.htm
"IT sounds like the plot of a dystopian Hollywood film: thousands of mutilated, tortured and sexually abused children being saved from underground tunnels across the world.
Yet this disturbing 'rescue mission' is among the lurid claims of QAnon"
https://www.thesun.co.uk/news/12798527/qanon-conspiracy-trump-condemn-theory-lies-covid-children-tunnels/
"subterranean demons to torture, rape and eat kidnapped children in underground military bases"
https://www.salon.com/2020/09/13/what-are-the-true-goals-of-qanon-its-the-21st-centurys-ultimate-catfish-scheme/
"The "underground" comment is a reference to a long held belief from QAnon that there exists a network of secret underground tunnels"
https://www.newsweek.com/qanon-supporters-joe-biden-cicada-neck-shows-plan-working-1599401
The subterranean battlefield: Warfare is going underground, into dark, tight spaces
https://www.militarytimes.com/news/your-army/2019/02/26/the-subterranean-battlefield-warfare-is-going-underground-into-dark-tight-spaces/