The more powerful the martial spirit, the harder it would be to make progress. But, once one made it through, the power increase would be more obvious as well. Although there was only one rank difference between rank 5 and 6, the power would be couple times stronger, while the gap between rank 6 and 7 would be even bigger than the difference before. If rank 5 martial spirit was a king warrior's martial spirit, then rank 7 would be emperor level martial spirit. Anyone with it could kill a Sea of Souls Realm master level warrior with one stare, and it was the gap between their power which would be impossible to ignore.
The being in the underground crack also had rank 7 peak level demon spirit, but the demon will projection he sent out only possessed rank 5 ones. Even the main Demonic will only had a rank 6 demon spirit, so it would be impossible for them to fight against a rank 7 spirit. Therefore, all of them had been shattered with that one 'he!'.
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