Lin Mu had already seen techniques that required cultivators to bathe in poisonous liquids, shatter their bones, burn their organs, and even replace parts of their bodies with materials taken from Immortal Beasts. The Wild Peak disciples were certainly reckless enough to attempt such things without proper preparation.
Perhaps the restriction existed to prevent an enthusiastic new disciple from finding a Top Grade technique on their first day and deciding to dissolve their own skeleton before dinner. Considering his experiences over the last two days, Lin Mu found that explanation surprisingly believable.
"Later," Lin Mu said to himself.
He had already spent plenty of time looking through cultivation techniques, so he decided to move onto another section of the library.
Body cultivation skills.
