Shingeki No Kyojin Season 3 Episode 7 -

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."

In a desperate, final act after being rejected by Historia, a crippled Rod Reiss licks the spilled serum from the floor, triggering a catastrophic transformation into a massive, misshapen Titan. 💡 Critical Reveals Shingeki no Kyojin Season 3 Episode 7

It is confirmed that only those of Reiss/Royal blood can fully utilize the Founding Titan's memory-altering and Titan-controlling powers. Overwhelmed by guilt after learning his father, Grisha,

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. Shingeki no Kyojin Season 3 Episode 7