The series takes place in the Suikoden Tierkreis multiverseThe Book of Night With Moon is the main world's Chronicle, making Kit a Reader. The Lone Power is equivalent to the One King.
The One Power is the Doctor.His sonic screwdriver is his version of the Manual (every Power has one; we saw the Lone Power's in the first book, remember?). The Lone Power is the Master.
Discord is My Little Pony: Friendship Is Magic 's Lone Power