He Just Became the Immortal Emperor and Was Summoned from the Earth by His Granddaughter.

Spiritual energy revives the third era. The earth has experienced two spiritual energy surges. The power of the thermal weapons of the old era was weakened, and individual power became dominant. Martial arts replaced science and technology and became the mainstream of society, and countries reorganized the layout with powerful warriors and sect forces. Ancient ruins and caves and blessed places have appeared one after another, and mankind has entered the era of high martial arts where opportunities and dangers coexist. Protagonist Goldfinger: Sign-in system. Although the protagonist himself is already at the peak of his combat power, the system serves as his "newbie guide" after returning to Earth, helping him quickly adapt to and understand the new world. Function: Check in at special places on the earth (such as famous mountains and rivers, ancient battlefields, city landmarks) to get rewards related to the place. For example: Sign in at Mount Tai and get the "Earth's Dragon Vein Distribution Map"; sign in at the Great Wall and get the "Humanity Qi Luck Body Training Method"; sign in at your granddaughter's school and get the "Halo of the God of Learning (valid only for granddaughters)". System rewards focus on information, assistance and fun, rather than directly improving the protagonist's full-level combat power. Hierarchy system: Earth's martial arts system: Ming Jin > Dark Jin > Hua Jin > Grand Master > Grand Master > King of Martial Arts > Emperor of Martial Arts > Martial Lord > Martial God (the strongest person on earth in a century) The realm of the protagonist: Mortal Immortal Emperor (has transcended all hierarchical systems, and the God of War is like an ant in front of him)