A world's noosphere is not something to be messed with. When damaged, it becomes hostile, alien and completely unpredictable. It's something that became evident after June 11th, 2006 in the Ukrainian Exclusion Zone, at the time of the second Chernobyl disaster.

It can also affect connections between worlds unrelated to its own, as three Equestrians – two ponies and a dragon – unwillingly find out.

A S.T.A.L.K.E.R. crossover, set at the end of Equestria Girls and S.T.A.L.K.E.R.: Clear Sky.