The Colony (2020)

From publisher blurb:

The future. After a world-wide, virulent pandemic dubbed The Fourth Horseman wiped out civilisation, survivors at Ares, the international base on Mars, listened helplessly as humanity sickened and died. Communication became erratic before ceasing completely. The colonists were on their own, the last living people... as far as they knew.

The people of Ares no longer think of themselves as being from Earth. Nor do the aggressively genetically-engineered young adults of the Fourth Generation look strictly human any more: larger, thicker skulls, thicker bones, and big eyes. Sometimes, they catch the older people staring at them. Sometimes, even their parents stare at them.

Unfortunately, an unexpected side effect of the genetic manipulation was a boom in the birth of twins, triplets, and quads. Mars has too many strong, and loud, and disrespectful children, and there is friction between them and the adults.

The number of young adults in the Fourth Generation is too high. It is time to expand; it is time to take back the Earth… It belonged to them once; it will belong to them again.

A setting for the Everywhen RPG. Includes an introductory adventure, 6 pregens and a blank character sheet.