Well as it turns out, Husak is the only slaver nation in the Pact of Light (the religious pact with celestial powers started after a great war against demons that established the civilized nations). Their slaves are mostly goblins, but some humans and hobgoblins who's caste was reduced to slave caste as punishment for their crimes. This mix of slaves gives many of their farm and work sites both a day and night shift allowing almost continuous work. The primary industries for the slaves is lumber, crops, and stone quarries. Slave servants exist but those roles are typically filled by low caste employees rather than slaves.
Warriors amongst the Hobgoblins rarely become slaves however, they almost always choose to fall on their swords rather than face that dishonor.
Pyrotech