Lao Chu

Owner of the Jade Dragon Opium den, debtors of which began to be killed by a Jiang Shi in late 1892. He denied all knowledge of the deaths, expressing regret at the loss of custom, if not at the death of the debtors.
Eventually, in June 1893, he was confronted by Rig and Sir Robert, during which time he attacked them with supernatural powers.
A curious field of lightning played accross his body which stunned Rig as the boxer struck him, then vanished, even as the sorceror collapsed, dead.