```
However, Song Cheng did not give up but propped his elbow as he pondered, organizing the known information, trying to find a solution.
When the Yin Qi calms, the taboos each slumber.
When the Yin Qi surges, the taboos' activities intensify, and upon awakening, they begin to expand their territory.
By normal logic, it could be deduced that their purpose of expanding territory is likely to occupy more Yin Qi.
It's like a greedy snake crawling on the earth, patrolling, devouring clusters of Yin Qi.
The more Yin Qi it eats, the bigger the greedy snake becomes.
Big snakes eat little snakes, eating until they become even larger.
This was the most probable way for taboos to become stronger, at least one of them.
