Wang Cao and his father were only partial Dragon Keepers , as they did n't have all of the signs .
Wang Cao , a herbalist who used to be Long Danzi 's companion until they were separated by dragon hunters .
herbalist   and Wang Cao 's father were only partial Dragon Keepers , as they did n't have all of the signs .
Wang Cao , a herbalist who used to be Long Danzi 's companion until they were separated by dragon hunters .