Ever since he learned about the existence of the corrupted druid, Aksai had been studying all he could about the demonic cultivators from his homeworld, Dadangar.
This was because he felt that there were some similarities between the demonic cultivators and the corrupted druid from Martial World Sharang.
Know thy enemy. Aksai had always believed in this line.
So when he started to understand the practices of the demonic cultivators, he also began to form hypotheses about the corrupted druid himself.
Aksai believed that the corrupted druid was cultivating the negative emotions of all living beings inside the Devil's Den. He was using these negative emotions as a catalyst to achieve a breakthrough into the 2nd Spirit cultivation realm.
As far as Aksai could tell, the Devil's Den and the demon tree served as parts of the Yantra in the corrupted druid's Spirit cultivation technique.
Strength doesn't come from what you can do; it comes from overcoming the things you once thought you couldn't.