A partial Ace Combat: Assault Horizon crossover. A Russian MVD Spetsnaz team find themselves in the wreckage of their Mi-24... Without a clue as to where they are, they will find that they are not alone, and under attack from everything around them.
A S.T.A.L.K.E.R, SoC crossover. When a STALKER named Valera gets the call to investigate a strange Anomaly, he figures it will be a simple job. Nothing could go wrong with just looking at it, right?
Only a single generation after the Solar Sisters have fallen to old age, the nation of Equestria collapses as the various species of ponies squabble and divide. And thus an age of conflict has arisen, and with it the empires of old have returned.