In the Touchstone Trilogy (Stray, Lab Rat One, and Caszandra),
by Andrea K Höst, young Cassandra Devlin unexpectedly walks through a dimensional gate and onto an alien world, where humans use nanotech and psychic powers to fight a desperate war threatening all of existence.
With this CORE RPG setting chapter, you will be able to join that conflict, helping to rebuild hope of human survival.