Steel, guns, and demon lords

The decrees of heretics, the supreme truth. The cycle of rebirth ceases, transcending worldly ties.
The beginningless true understanding illuminates the endless darkness. Severing the cycle of reincarnation, one dwells eternally in the true heaven.
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"This time, we'll burn the Lingxiao Palace to ashes."
……
This book is also known as "The Cultivation World Has Its Own Johnny Silverhand".