Here we have the Crystal Empire episode in the Harmony Crusaders Universe. In the episode, Dinky would be in charge of protecting Princess Cadence (who, in this case, is an infant), while her sister and brother-in-law protect the empire from King Sombra and while the other harmony crusaders search for the crystal heart. In this episode, King Sombra would actually be a threat and have speaking lines and be a totally awesome villain, so here he's making a proposition with Dinky that she can't refuse: trading what he needs (Princess Cadence) for the one thing in the whole universe she cares the most about. Evil, no?