Needful Believers Are Good Believers.
Aeternus turned to leave after speaking to them. His destination is the newly created altar within the stronghold. He entered the huge fortress and walked by the waiting demons of his army. The fortress is teeming with them. There are about a hundred thousand in the fortress and many more surrounding it. Some of them will be left behind in the plane but most of them will be unleashed on another plane.
He began activating the return function of the abyss altar. It responded quickly because he has created a connection between the two planes. If not, he would have had to spend a day to open it. A large swirling portal opened quickly and sin energy gushed out of it into the plane. It made the demons feel like they are in the abyss.