Inside his own mind, Daneel felt trapped.
After joining the separated piece of his consciousness with the rest, he hadn't been able to form thoughts for what felt like the longest time. But just as the system had predicted, the increased strength of the opposition made it so that his mind won small victories against the ghosts that had only managed to corrupt a patch of land around them.
This made it so that he could slowly regain the ability to think, but his body was still under the control of the Axelorians. The first thing the ghosts had done on entering him had been to cut off the connection between his physical and mental self, so if he wanted to be able to help in the war once again, he needed to defeat this opponent.