Xia Qi

He once happened to come across an injured Tian Gu and helped him so he gave him two poisons. The parasite dragon which was used on Xia Zixi and a soul-snatching parasite which was used on Xia Linyu which resulted in the originals death.

After Gu Ruoyun came to the Xia Family he tried to plot against her by framing her and once that didn't work out he sent people to attack Xia Linyu under the name of Hundred Herb Hall so that Xia Zixi wouldn't be treated.

When Tian Gu came to the Xia Family and exposed him he was forced to be a body double so Lingxiao could come out of the rune matrix.