Aurora observed the whole process from afar, needless to say but she was surprised that Daimon could order someone under a contract to die, which is certainly a terrifying ability.
There is a reason as to why the slave market doesn't focus on battle type but either on workforce or the luxurious type, which includes races that are appealing to the eye or are rare, such as Marlene's angelfish clan which falls in both of the categories.
Anyway, is better to nurture guards, like the White's royal family does with the royal guards, than to buy slaves to act as guards, because a guard must be stronger than the one who is protecting.
So as small as it might be, there is a chance that the slave finds a chance to escape the contract, and kill its previous master in retribution, in comparison slaves meant for pleasure don't need to be strong, so they are easy to control, as for those used for physical labor, a single designated strong mage acting as foreman, can control them.
