The word you're looking for is waning. When the moon's illumination is increasing, it is waxing.
Factors increasing erosion
Coastal erosion: the strength of the waves breaking along the coastline. Bigger, stronger waves have more erosive power.
Abrasion - rocks carried along by the river wear down the river bed and banks.
Attrition - rocks being carried by the river smash together and break into smaller, smoother and rounder particles.
He has the authority to command orders and he also gets to rule a country that he has to make sure is safe and that he is earning profits.
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From what I know, compasses and other magnetic things would not work.
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