While the Petra aren't the most intelligent race, they make up for that with there strength and sheer numbers. They are known for swarming their enemies until they can completely surround them. Communication is their weak point which can make working with them very difficult. Be sure not to anger them in the process. They almost exclusively make use of physical weapons, there are very few within the race that make use of the aether.
The Sicarius are ruthless, silent, cold-blooded killers. They are known for their many expert assassins. The race as a whole is very agnostic towards politics and prefer to work for the highest bidder instead in whatever business or profession they peruse. Sicarius Mercenaries often make use of small, fast weapons combined with illusion and destruction spells to combat there enemies.
The Mutans are one with nature. They are a fairly peaceful race and only serve to worship and protect Mother Nature. Mother Nature is the main deity they worship and they will do anything to protect her. Don't let their peaceful nature deter you - they are exceptionally strong mages often making use of the most abundant elements of nature to their advantage. Once you cross a Mutans once you won't make the same mistake twice.
Neither dead nor truly living, the Interitus are a very organized race of ghoul like creatures. Making use of dark magic and one handed weapons, the Interitus are vicious battle mages. Silent in the night and keeping to the shadows, you never know when they are near until it's too late. The Interitus aren't very organized as a whole; instead they are littered across the various regions, each with their own unique story of how they got their.
There is only one word to describe the Praelia - warrior. From the time they are born, the Prealia are born to be strong warriors. Only the strongest survive and often those too weak to fight are banished and become outcast of the republic if they are lucky enough to make it out alive. All decisions are handled by the council which is elected by the people. Praelia are very involved in world politics and believe their views are the only correct ones, those who disagree will be crushed.