Greater strength meant greater soul intensity.
The bubble's transparency depended on wisdom in the Real World, a point Alka couldn't guarantee.
Human Dream Bubbles were mostly opaque, like frosted glass, making it difficult to see inside. Animal Dream Bubbles, in contrast, were completely transparent, allowing a clear view of their interiors from even a short distance.
Alka hadn't encountered creatures of intermediate intelligence, so he didn't know how their bubbles manifested.
He simply surmised it might be related to intelligence.
The bubble's luster fully reflected the individual's mental state in the Real World.
For instance, after Alka's dream-body stand-in died twice, its Dream Bubble was not only riddled with cracks but also very dim in luster.
This was because Alka's mental state hadn't been good at the time.
Thus, from his own experience, he knew that cracks in a Dream Bubble were strongly correlated with soul damage.
