Greenskin

Greenskin (Amakmat in ancient language) is a racial group that includes all the humans who evolved to have green skin due to the presence of esoteric energy in their body. As a side effect, their brain and blood were also mutated in various ways. The 5 races considered as Greenskin are: And all of their subspecies.
 * Goblin
 * Grakon
 * Ogre
 * Orc
 * Troll

Features
Due to their unnatural appearance they are often feared and hated by other races and this contributed to enhance relations between Greenskins, effectively isolating their races. Since their birth they easily melted and gained aspects of other races, but held different traits.

Their blood is darker than humans, it's acid and easily flammable. This leads to a rubbery skin that regenerates more often and is almost immune to normal infections, as the bacteria entering the purple liquid are immediately dissolved and devoured by the immune system.

They reproduce much faster than any other races. More over, the mother stays pregnant for less than 3 months and the child is fully adult between 5 and 12 years after being born. In Wi this fact is abused by the state who gives monetary prizes to family of Greenskin warriors for each of their sons sent to war.

Common to all of them is a general idiocy, seen as plain stupidity in orcs and trolls or as a blindness to their actions' effects in goblins. The highest mortality rate is held by self-caused accidents (Setting themselves on fire, cutting their own body to death, being devoured by summoned monsters etc), followed by battle casualties.