With the limited time that Caizher has, he checked for all the things he currently has. All his slaves and Terror Phantoms were sent back to his realms by that foreigner
After all, the heavens don't have any restrictions now. Since the Terror Phantoms came from Caizher, they can also be perceived as a threat in this Universe. They could be destroyed by a mere thought from her
Caizher also has the two spirits of water and earth. They are certainly powerful beings, their power is almost at the demi-god rank. However, even if they help Caizher, they are still not enough
The heavens can basically use anything in this Universe to kill him. That is including the numerous Emperors of this world. Just those Emperors are already enough to kill Caizher if enough of them surrounded him