The pill cultivator is a scum who test his pills in other cultivators (he have kill several of them) the slave is a cultivator that he got as a slave and he kinda tortures him but he is the only one to survive that much because everyone else is death,btw the pill cultivator gives them a pill so they can't disobey him, but the mc gets rid of the effect with the help of his thunder Root and the help of the cultivator that gives him the heritage (if I don't remember wrong)