The Heavenly Monarch is currently in his weakest moment in life. Even if he was reborn using a backup body, the injuries from the failed ascension still leave him extremely vulnerable.
Otherwise, he wouldn't have placed the newly cultivated body in the open and let "Ji Wen" hide in the shadows.
Using a scheme was indeed a last resort.
Not to mention, both bodies haven't undergone long-term refinement. Their state is not good, and one is even injured. Even absorbing the essence of Elder Kaiyang, a martial artist, is just a drop in the ocean.
However, even in this state, the Heavenly Monarch wouldn't consider himself a sacrificial offering for Tan Wuwei.
At that moment, "Ji Wen" snapped his fingers, and the talisman embedded in Elder Kaiyang's body twisted him into two parts. The two bodies then converged, and "Ji Wen" thrust his hand into the massive wound on Elder Kaiyang.
