I decided night to call it Revenge of the StarChaos cause the idea is changing in my mind....so here it goes.
With the Fairoze safetly back at Achates Academy, the Souls continued to train for the next mission. But the Immortals aren't giving up that easily. Even though they lost several members, they go out to hut easy victims to join them. That victim might send the Souls just over the edge when the next item has been spotted.
They learn that its a red diamond heart that is said to have a blue violet rose trapped inside the glass. It is called the Alister Heart with unknown powers of the shadows. Souls set off to a Nameless city then to an abandon mansion that had seen better days. As Immortals take down one Soul at a time, Souls would need any help they can get from the InkRebels and MirrorKnights. Cause something lurks in the mansion to trap them forever.