The known relationships of the Stone general Kozu.
The Overlord was Kozu's creator and master.
Kozu was created by the overlord and would be the leader of The overlord's Stone Army, acting as the temporary supreme commander when his master was occupied elsewhere.
The soldiers were Kozu's army.
In the Overlord's absence, Kozu would act as the temporary supreme commander when his master was occupied elsewhere.
Dareth is Kozu's mortal/arch-enemy.
He used the Helmet of Shadows to take control of the Stone Army which ended up turning the tide of the Battle against the Overlord and a factor in Kozu's death.
On The Day of the Departed, Kozu targeted Dareth for his previous actions only for Dareth to reclaim the Helmet of Shadows and turn Kozu's allies against him and sent him back to the Departed Realm
Because the ninja opposed him, Kozu sees them as enemies.
Kozu sent his soldiers after them and the ninja held them off.