The Astrals are no less tangible than skydwellers, so it would be simplest to consider them invaders from outside the Sky Realm.
Setting that aside, we were created with sentience. The ability to think independently and feel emotion, form bonds, as other beings do. The Astrals expected primals to function as tools despite this, and took measures to suppress and control. They had means by which to force primals to do their bidding even if it caused them great suffering.
It was the cruelty of this, as well as interactions with the Skydwellers, that ultimately led to that rebellion.
no subject
Setting that aside, we were created with sentience. The ability to think independently and feel emotion, form bonds, as other beings do. The Astrals expected primals to function as tools despite this, and took measures to suppress and control. They had means by which to force primals to do their bidding even if it caused them great suffering.
It was the cruelty of this, as well as interactions with the Skydwellers, that ultimately led to that rebellion.