Once the Imprison divine ability goes into effect, the target will become blind and deaf. They will become a prisoner in their own bodies. All they will see and feel is a darkness around them.
The best part of the Imprison divine ability is that it can work forever. Once it takes effect on a target, it will use the target's spiritual energy to continue running.
So the slaver doesn't need to stress themselves after using the divine ability. They can imprison a target for years and wait patiently for them to crack.
Apart from the fact that the Imprison divine ability makes it easy to torture a target and make them submit, it will also make it easy for slavers to kill their enemies.
But if the total sensory deprivation and complete weakness that the Imprison divine ability causes are not persuasive enough, Slavers can use their rank 2 divine ability called Life Siphon on the target or use their rank 5 Whip divine ability to make them Crack faster.
