Power
An opera singer isn't powerful in the traditional sense of the word. The power of an opera singer is emotional, rather than political. The only place you'll be commanding military is on stage while wearing a wig. That's probably a good thing, though; we're not sure the battlefield is the best place for your diaphragm to stay limber (unless you're doing a lot of yelling).
Artistic power is definitely its own unique kind of power. If done well, your performance could have the ability to move thousands of people to laughter or tears. Should your performance touch the soul of the gathered masses so deeply that they rise to salute you with one of those rare beasts known as a "standing ovation," then you'll get a personal impression of just how powerful your talents can be.
This is one of a very few linguistic art forms that doesn't find its power coming from the words that are spoken. While your Italian, French, and German crowds will likely understand you, the rest of the world likely won't have a clue what you're saying. That's the unique power of opera—giving people that sweet emotional release whether or not they speak the language.
As in many creative ensembles, you'll find a hierarchy (or if you prefer, kingdom) where certain performers (usually the leads and/or veterans) will speak up the most often and give direction to younger and less-experienced members. It's very important to know where you fit in this system―if you want people to follow your lead, you're gonna have to earn it.