Rod reveals that past Reiss family members who inherited the power also inherited the First King's "will," which prevents them from ever using the power to eliminate the Titans outside the walls.
Attack On Titan Season 3 Episode 7 Review: Wish | Den of Geek Shingeki no Kyojin Season 3 Episode 7
Kenny Ackerman discovers he cannot use the Founding Titan's power because he lacks royal blood, leading him to abandon Rod and allow the chaos to unfold. Rod reveals that past Reiss family members who
Overwhelmed by guilt after learning his father, Grisha, killed the Reiss family to steal their power, Eren breaks down and begs Historia to eat him so she can "save humanity." Shingeki no Kyojin Season 3 Episode 7