Gu King Pill.
It's a forbidden pill, a terrifying elixir in the Ancient Martial World, feared by many due to its ruthless nature, and therefore it has always been banned.
The Pill Masters who craft this elixir are even considered among the top ten evils of the Ancient Martial World, known as Gu Masters.
As one of the ten major Gate Valves of the Ancient Martial World, the Lin Family had once crusaded against the Gu Masters in their early days. Since then, the Gu Masters have disappeared, with rumors of their deaths.
However, for the Lin Family to now produce the Gu King Pill, clearly, it's not that simple.
The Gu King Pill is somewhat similar to the Gu Worms from Miaojiang, but through the secret technique, it becomes more powerful. Once ingested, it carries some Bone Strengthening and Marrow Cleansing effects, and when the Gu King parasitically attaches, it provides the host with immense power.
Of course, since it's a Gu, it can be controlled.
