Goblins

Appearance
Goblins, like in all other fantasy novels, possess short, deformed, green bodies. They have long ears, wrinkly faces, a bulbous nose, red bleaty eyes, fanged mouths and bald heads.

Once again in your typical fantasy setting, the goblins can evolve into a hobgoblin. Hobgoblins are smarter, stronger, bigger and less deformed versions of your regular goblins.

All goblins, thanks to their tough skin, do not require a lot of clothing so they are often wearing only the necessary rags to cover their privates.

Goblin Castes
Goblins can be separated into 3 castes.

The first caste are regular goblins. They are treated as disposable by the other castes. Their intellect is average except for machinery and their fighting capabilities are weak.

The second caste are the shamans. They are the mages and the wise men of the goblins. They usually serve as leaders of smaller goblin groups. They are also well versed in natural medicine which they use to make a drug named "Happy" which puts the goblins into a state of no fear. It is an excellent boost to the already horrifying Goblin-wave tactics the goblins use for combat.

The final caste are hobgoblins. They are regular goblins that have been transformed using a potion made by the shamans. As previously mentioned they are a levelled up version of regular goblins. In bigger groups they serve as nobles and high level leaders.

Goblin life
Goblins live in tribe like groups, usually led by a shaman.

They eat everything but prefer meat. In cases of emergency, cannibalism is regular. Even though their societal structure is mostly pretty simple, the goblins on the Goblin Island have shown abilities such as scheming and information manipulation in order to win their disputes.

After becoming a part of the UN, most goblins have shown talent for machine working and are now employed as engineers and workers. In the military they have assumed positions such as service repairman and hangar bay operators on aircraft.

Detailed examination of Goblin physiology
Their skin is coloured in a greenish grey hue.

Their blood is, interestingly enough, yellow in colour.

Everything is very similar to a 10 to a 12-year-old human child, except they have thicker and tougher skin, a heightened immune system, more efficient organs and digestive systems compared to an adult human."

By the way, their blood is green is due to the double copper atoms in their blood. Oxygenation causes a color change between the copper atoms, hence it turns green."

She then highlights the scans and said, "On the right is the brain scan of a green skin while the left is a human scan. The highlight parts are where we measure intelligence or how smart a person is. If you look at the human scan, which is of someone with an IQ of 190, and compare with the scan from a green skin, it is almost identical."

Blake raises his eyebrows as he listens to Dr. Sharon words. "Wait, you mean that they are all geniuses?"

"No, not geniuses, like maths prodigy or rocket scientists but of intelligence. Meaning they are smart, learn fast and adapt fast." Next, she highlights another area on the scans. "This shows the level of aggressive activity of the brain, which is abnormally high."

"So this is my theory that they are not a declining civilization but more of their culture as scavengers and cannibals like some ancient human tribes in the past as we discovered many discard items, with their own distinct design styles and manufacturing methods."

As for green skins or goblins as you called them, they are similar to us, people who have what we called colorless affinity, meaning we can cast either element of magic. Like us, their magic is constantly being used and does not accumulate into stones."