Nedenah

The Nedenah are short, bluish-grey-skinned humanoids with slender limbs and elliptical green or blue eyes, which travel through space in flying saucers. Their blood is brownish yellow in color.

Although they have been known to visit Earth for thousands of years, their visits have been purely for scientific observation and they primarily avoid contaminating human culture. Unfortunately, in 1947 one of their ships crashed in Roswell, New Mexico and the inhabitants were forcefully brought to Area 51, where the USA military has been studying their technology ever since. They are described as old enemies of the Waro and are also at war against the Viperox.