The Legend of the Underworld King of Douluo

Douluo fan fiction, tragic male lead, no System or cheat, success through hard work, not a cheat, fate, devoted and faithful love, duty to family and country, slow burn, an ending that leaves you aching

Over the course of ten thousand years of change, the so-called god-slaying hidden weapons, soul-guidance technology that surpassed all else, and knowledge that could theoretically lead one to godhood have long since faded like smoke. All that remains is a war.