Goliath

"'Served in Ukraine, Russia, Arab Emirates, Iran... All forgotten names by now, I knew it was all building up to this, but the high brass wouldn't give a shit what a mutant thinks, I was supposed to be a tool, and tools do not speak.' - A venerable Goliath"

Goliaths are super soldiers created before the Great Collapse by the American government in a secret project simply known as "Project Goliath".

Using a powerful mutagen serum with the intent to create massive and powerful soldiers for military operations. After successfully testing the serum on gorillas and other primates, they began to use human test subjects, which were mostly volunteers from the Marine Corps. After several years of testing, the project was considered a success and Goliaths saw service in various special, secret operations in various conflicts throughout the world.

After the Great Collapse happened and the bombs fell from the sky, Goliaths emerged from the military bases they had lived since the day of their transformation and created small communities where they live in relative peace. Despite their intimidating appearance, Goliaths are actually a very gentle and calm race, usually they try to talk their way out of fights, not because they are afraid of a fight, but because they know they can kill everything in their path with ease.

Biology
Goliaths are massive, standing between 8ft tall to 11ft tall, and there have been sights of even bigger ones deep in their territories. They have green skin, yellow eyes and are incredibly muscular. They are unable to grow hair on their bodies and most are bald, but there's been a few exceptions.

Goliaths posses superhuman strength and endurance. Despite their massive muscular frames and mutated appearance, Goliaths are incredibly intelligent and are pretty good with machinery and robotics. Most Goliaths are from the age before the Great Collapse, which leads many to believe that they are immortal - or at the very least, long lived.

Despite their all these benefits, Goliaths do come with some disadvantages, due to their large size they are not good at sneaking about, they are also unable to crawl through smaller spaces. One of their most detrimental flaws however, is their slow reproduction, which keeps the numbers of the Goliaths quite low.