A group of armed ponies sent by an infamous organisation took Twilight and the ones that she care about as hostages and demanded Princess Celestia to step down from power. Hope was fading until a group of counter-terrorist operators intervened.

I do not own Rainbow Six Siege, it belongs to Ubisoft.
I do not own My Little Pony: Friendship is Magic, it belongs to Hasbro.
Finally Rainbow Six belongs to Tom Clancy.