A Poor Taoist Started Cultivating Immortality from Immortality

[Eternal life, one person plus one dog, no heroine, not invincible, Le Ziwen, no sword] Zhang Jiao traveled through the world of immortality and gained immortality and a portable small world at the beginning. While others have been practicing hard for hundreds of years, he is sunbathing and walking dogs; while others are fighting for secret places, he opens a medical clinic and sells "Viagra". A big black dog, a mace, and a small world full of medicinal herbs, this is his entire daily life of cultivating immortality. Until the war between immortals and demons broke out, ancient ruins appeared, and the genius son fell... Someone always saw a big black dog squatting on the edge of the battlefield, chewing bones. Next to the dog, there was a young man holding a grass root in his mouth, eating melon seeds and sighing: "It's boring to fight and kill, why not learn to sell medicine from me?" Later, a legend spread in the world of immortality: Every time there is a drastic change in the world, a person and a dog will appear quietly. Not to seize treasures, not to seek hegemony, but to watch the changing times silently. The world calls him - the Black Dog Immortal.