Part 7/8:
Both Saruman and Sauron experienced conditions that could lead to profound debilitation; when their power reserves became critically low, they faced the risk of losing their ability to manifest physically. Sauron's eventual physical manifestations diminished over time due to the energy dedicated to the creation of the One Ring and maintaining control over his minions.
Saruman's path diverged significantly as he depended on his influence and manipulation to exert power over others, which depleted his reserves considerably faster compared to Sauron's more strategic use of power.