Soul of reincarnation

In the sea of ​​darkness, there are two artifacts born from chaos.One is to control reincarnation, and the more dead souls are washed, the more powerful it becomes.The other is doing nothing because there are no rules of control. Although it also becomes powerful because it is washed in the sea of ​​darkness, this power seems to be useless power, because it does not have any ability or function.Like an indestructible rock.