When it comes to describing something as powerful, there are many different words that can be used as synonyms for "were the power of". Some of these include phrases like "were the force behind", "held sway over", "exercised control over", "dominated", and "held a strong influence over". Other synonyms could include "commanded", "ruled over", "reigned supreme", "had mastery over", or "held all the cards". Each of these phrases and words conveys a sense of immense power and control, and can be used to describe everything from political leaders to supernatural beings and forces.