Remnants of the Void (FoZ/RWBY)

When Louise's desperate attempt to summon a Familiar and prove herself a mage backfires spectacularly, she, Guiche, Kirche, and Tabitha find themselves stranded in a new, strange world with a shattered moon. With no idea how to get back to their own world, the four students of the Tristain Academy of Magic must find their way in Remnant, and perhaps discover some new things about themselves along the way. But dark forces are at work in this new world and Halkeginia both, and the four find themselves thrust head-first into a conflict going back thousands of years.