Although the grand elders corpse was the perfect vessel to use and transform into a corpse puppet it would no longer have the abilities it had when it was alive but be left with the bodies overall endurance, strength and speed thanks to the physique of an unrestrained realm powerhouse that had undergone over 60 years of harsh training and overcoming the harsh northern climate.
It made the perfect vessel to be used for ki's plans but it was a shame the body could not make use of their life's martial arts comprehension, instincts and their qi so Ki made plans to make up for that weakness in combat and thought of a poisonous body strengthening recipe from the poison clan.
The recipe was toned down for human use because of its toxicity but the dosage is increased for those that practice a poisonous qi art.
Ki had been using the toned down version to help strengthen her body further along with her blood Buddha qi art while soaking in a bath of the solution after feeling no further effects from the medicinal baths she was taking.
Not only did the poisonous body strengthening recipe help to strengthen her body better but it also helped her to improve her bodies immunity to poison, strengthen the toxicity of her poisonous qi but also keep her silkworm Gu well fed and full of energy to put towards its evolution and production of silk.
After getting the idea to implement the recipe to the corpse puppet, Ki decided to make the best use of the fact that the body was not living so the poison would not have any effects on the body itself and would not experience any feelings of pain, irritation or the additional effects.
After increasing the effects of the strengthening and hardening part of the recipe to its maximum effects and potential, the poison intake also increases and is absorbed into the body after soaking in it for a long period of time, eventually the poison would permanently become part of the bones, internal organs, muscles, tendons and skin so anyone who came into contact with it would be poisoned if they had direct contact with the skin on its body.
If it was the normal recipe Ki and other poison qi users would be able to use the absorbed excess poison as a supplement to improve their poison arts further while tempering, strengthening their body and its endurance but since the body was dead it became a vessel for the poison as it continued to temper the corpse puppet and help to also preserve the bodies current state and avoid further decay and other weaknesses like having mild resistance to fire.
The fire and heat resistance wasn't that great but it was enough to be able to defend against its main weakness and it's tougher body also helped to better protect the head where the Gu worm is located.
Over time it would only grow stronger the longer it soaked in the poisonous body strengthening recipe.
Just like the divine ice sect uses and takes their martial arts from an extreme form of coldness many other ways have their own influences of training and using extremes in their way of life.
Many people train in extremely cold or hot environments to train their endurance but also the extreme conditions help to strengthen their will and body further beyond their limits.
The same is true for medicine and poison on their own extremes, medicines can be used to improve health, cure diseases and strengthen the body but it can also become harmful if the body consumes more than it should be able to handle.
Poison is the opposite of medicine but while it can be used to poison someone and inflict harm it can also be used to cure others in some cases of using poison against poison or even using it to strengthen the body with some risks involved.
There is truly no direct answer to what extreme is the correct one but Ki was more of a believer in balance after her time studying the poison clans inheritance.
Poison and medicine are both made using plants which are of the wood nature within the world but while one path goes down one extreme another goes the opposite path but in the end they came from the same source.
There were many recipes that were very dangerous but if they were consumed alongside their opposite in nature then as they balance out one another the body can sometimes benefit from it.
Ki did not find the low resistance to fire that big of a problem, in fact it just gave her more of an opportunity to experiment with the poisonous corpse puppet in the future.