If there exists a rule “Explorers Phase”, add a rule “Explorer Actions” with the following text to the Dynastic Rules:

Where Planned Actions are concerned, the valid directions are North, South, East, West, Down and Up, or anything their current Room defines as an Exit Direction. North, South, East and West are the horizontal directions. Up and Down are vertical directions.

The available Planned Actions for an Explorer are:
Rest
Peek, together with a direction
Walk, together with a direction
Flee, together with a horizontal direction

Resting has no current effect.
Peeking has no current effect.
Walking moves the acting Explorer one Room in the indicated direction if such a Room exists, if the direction is horizontal. If the indicated direction is vertical, it has no effect unless their Room contains a Staircase.
Fleeing repeatedly moves the acting Explorer one Room in the indicated direction until something prevents them from continuing (for example, the non-existence of the Room they would move into) or until they would attempt to move into a Room that they previously exited during the same Mansion Phase.

The default Planned Action is to Peek North.