The Lost Immortal Sutra itself was very pure without any special attributes. It didn't have much augmentation effect on the body. Only its usage of Essence Energy was very powerful.
However, this strength wasn't targeted at combat. Therefore, Zhou Wen seldom used the Lost Immortal Sutra in combat. He would basically add a simulated Essence Energy Art to it.
I hope it's of some use. Zhou Wen was only making a last-ditch effort. At this stage, he couldn't give up unless he tried all the possibilities.
In fact, Zhou Wen didn't even need to circulate the Lost Immortal Sutra himself. It constantly circulated in his body.
He removed the various augmentation powers and restored the most primitive state of the Lost Immortal Sutra.