All of these societies and factions relate directly to my plot, so it was natural that they would occur to me. But why not add societies that flesh out the world from the start? What I feel is important here is that the groups add a more dynamic feel to the world, that they all interact in some way, with their own goals in mind. Almost like characters in their own right.
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I began with only the countries' societies.

Duthonne: Moderately religious. Strongly oppose heretics. They believe that four of the gods are good and that the other three are evil.

Meira: Moderately religious. Lightly oppose heretics. They believe the opposite to Duthonne about the gods, and the two countries war over this.

Arlea (island): Strongly religious. Believe that all gods are good. They have traditional beliefs and are the constant where the other two countries have developed their beliefs.

Then I began to wonder: Who is in control of these countries? Not all societies are the same in this respect.

The Church: They are the seat of power in Duthonne. Seven hundred years ago the King died and their was no heir to replace him. The Church were given power and have held dominance to this day. They believe very strongly, and are far too narrow-minded as far as teaching children about the gods. Their teachings have fuelled the wars, making many people fully believe that the people of Meira are as evil as the gods they worship, and ought to be wiped out.

Those who oppose the Church are punished, the punishment being equatable to the crime. Punishments can go as far as torture and execution.

The Queen of Meira: Elegant and powerful, she loves her people and treasures their lives. She is strong in her beliefs, but she doesn't go as far as the Church when it comes to punishment. She is willing to collaborate with various groups in order to help her country.

So what else is there? I was reading a book when the next came to me, and I had to stop reading to go and take note of it.

The Order: A faction devoted to the gods. All seven of them. Each member of the Order fights with the weapon of their choice. They know when the world is in grave danger and know a number of rituals in order to prevent it from happening. These are good guys, but their means might not be in line with what other people want.

And this last group came to me the other night when I couldn't sleep.

The Underground: A faction of thieves and pickpockets in Emareus, the capital city of Meira. They know ways into the castle that even the guards don't know about. The "Thief-King" has the supreme Aura -- that of Elcalades, the Giving Father. The group is made up of men and boys, mostly poor and orphaned. The group offers them a home as children, and they grow up in the environment and learn to survive in the streets.
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All these groups affect each other. They all have a purpose in mind. Teach, rule, serve, survive. The way they interact can create a very dynamic feeling, and when unlikely collaborations occur, they become all the more intriguing.

What could possibly bring the Thief-King to work with the Queen?

Why do the characters seem to think the Order is bad when it is actually good?

Who can bring down the Church, or find someone in the King's bloodline to take over the throne?

While we're journeying with our characters, things are happening on the other side of the world. Know what's going on, and you will know your world all the better.