I Am Invincible as a Tombkeeper.

Jiang Hao traveled through the fantasy world and became a handyman disciple of the Wanxiang Sect Cemetery. He thought he was destined to be mediocre in this life, but who would have thought that Jiang Hao would awaken the tomb-keeper system, and he could get rewards just by guarding someone's tomb. Guard the tomb of Lord Dan Ling for a day and get the divine blood of Dan Ling! Guard the tomb of the King of Beasts for three months and obtain the divine beast Dark Sky Tiger! Guard the tomb of the Wanxiang God Emperor for two years and obtain the Wanxiang Emperor Halberd! ... Unknowingly, Jiang Hao, as a handyman disciple, has become invincible in the world. Suddenly one day, all the enemies of the Wanxiang Sect arrived. Within half an hour, the Wanxiang Sect's protective formation was destroyed, and more than half of the disciples and elders were killed or injured. As a last resort, Jiang Hao dragged the Emperor's Halberd backwards and slowly walked out of the cemetery...