Rabbits got stronger every time they stopped and sang their songs.
However, Erix, Rin, Lilith, Lily, Aria, Isabella, Nira, Sameira, and Kenshin always managed to break through their skills and art of combat because they continuously clashed and exhausted them by countering the increasingly stronger rabbits each round.
They made use of the terrain or prepared structural skills to trap and exhaust them to get a boost from climate while making it such that it countered the rabbit's new traits after every singing session.
The hidden pieces were very easy to find because of Erix.
He also created a formidable comprehensive Eye-type ability. This Eye type was perception-type, detect-type, tracker-type, and various activities that could be done with the Eyes via the Vision and the Sense.
The purpose and the required capabilities to achieve that purpose were all that mattered.
