Profound Dragon Strength's modus operandi was quite similar to that of Profound Dragon Cultivation. The only difference was in the flux energy used. Profound Dragon Cultivation used the flux energy of the enemy while Profound Dragon Strength used one's own.
This could be used to burst forth with a large amount of energy, which made it a pretty good skill. But if it was used alone, this skill couldn't be regarded as much. Even without the system's analysis, Li Yunmu could estimate that it definitely didn't surpass B grade.
But if Profound Dragon Strength was used to provide assistance to Profound Dragon Cultivation, then their combined grade would increase to one which Li Yunmu couldn't estimate. The skill which used enemy's flux energy as well as one's own was simply like a wild fantasy.