The Edar Sventari (Draconic for "Earth Destroyer") are a centipede-like race that look like this:
They are conquerors and slavers, with a strict caste system.
Edar Sventari: They are the leaders, captains and anyone that has a political job.
Silit Thurirl: They are house servants, and one of the few things the Edar are fond of, but the Silit are not fond of them. Here are what they look like:
Mind slaves: These are the conquered races that are intellectual. They are architechts, enngineers, artists and more.
Labor slaves: These are the most common caste. They are the ones that are good at hard work. They work as soldiers, miners, and builders.
When a race is conquered, they are immediate assigned a caste.
Finally, the reason they got their name: They have huge mining vessels that mine a entire planet, once everyone has been enslaved. They then use the resources to build their fleet, artificial planets, and dyson spheres. Dyson spheres Their home galaxy as no natural planets left, except for a few radioactive ones that would harm the planet miners.
Their language is Draconic, Here is a translator:
http://draconic.twilightrealm.com/
I will do their backstory later.