Amara was someone Rubern wanted to pursue, and he wasn't willing to burn bridges with her. However, Adrian was just too annoying.
Rubern struggled to comprehend why Amara showed such favor to the recently recruited apprentice, despite the latter's inferior strength compared to Rubern's.
In Rubern's view, being her senior with greater strength, he believed himself to be an ideal companion for Amara. The mystery persisted as to why she remained oblivious to his presence.
The more Rubern thought