"The appearances of Deros are diverse since they come from any race. A short and aged appearance is the most common, though many inhibit the aging problem through life sustaining stim rays."
https://aliens.fandom.com/wiki/Dero
"The dero are notorious for their sexual orgies, and they apply “stim” machines that revitalize sexual virility and “ben” rays that heal and restore the physical body.
These mechanisms were created by the ancient Atlans thousands of years ago and are still in perfect working order, thanks to the technical perfection with which they were constructed."
https://occult-world.com/hollow-earth/
"Some Tero actually waged war against the Dero who had the advantage of combat with their Ben-ray, Stim-ray, Telesolidography, and Telepathic-Augmentor."
https://www.ufodigest.com/article/the-forgotten-visitors-the-psychrophiles-are-coming/
"These “stim” machines are what were found in the abandoned subterranean cities by the ancestors of the Dero."
https://www.veteranstoday.com/2017/11/26/return-of-the-titans-2/
"These Elders developed powerful ray technologies such as the ben-ray, which broadcast integrative, healing energies; the stim-ray, which allowed the randy giants to prolong and heighten sexual pleasure; the telesolidograph, which could broadcast three-dimensional images; the penetray, used to observe events from vast distances; and the telepathic augmenter or telaug, which transmitted thought"
"Thousands of us are shanghaied into the caverns each year to serve the dero as slaves, playthings or food, for we are a perennial favorite on dero tables. With ben rays, torture can be prolonged for months or even years. A popular dero pastime is to disassemble their victims under a ben ray, leaving them as living dissections. Surface women are wired full of "sex stim" and used as living furniture, the dero taking pleasure in their undulations; others are given "growth stimulation focused on breasts till they get enormous and give milk like a cow which they use for a beverage.""
http://www.shavertron.com/feardownbelow.html