On the way to Scarlet's mansion.
Cassandra didn't take her eyes off Strax. Unlike other vampires, she wasn't foolish. It was obvious that something unusual happened whenever Strax interacted with the world around them.
After all, he had just put a large part of an extremely dangerous city under pressure like it was nothing. Of course, she was still his wife, but she was also the most grounded, the one more tied to reality. Even though she knew a bit about the System, she was still extremely nervous and anxious about what might happen, which led her to be extremely cautious.
Strax, for his part, noticed Cassandra's vigilant gaze and understood exactly what she was trying to figure out. However, he didn't care, nor was he willing to explain what he had done; who cared? But actually...
'What a cool ability... so I can fuse abilities by merging them in the same place... Fufufu!' He was still thinking about his new ability, [Absolute Domain].