Rod was transformed into a Pure Titan, which is different from a Titan shifter and does not have its own will or thought. Much like the typical mindless Titans but Rod would go under the Abnormal Titan type which is an uncommon type of Pure Titan which we see few of throughout the series.
Pure titans originated from humans transformed by the Founding Titan into mindless soldiers for battle. Modern pure titans appeared when people were experimented on with wraith serum created by modern governments. Unlike with jaeger, wraith made the subjects into giant mindless and deformed versions of themselves.
In titan form, it's probably capable of more destruction than the Colossal is. But its range is much more limited that that of the Colossal, due to the Rod Reiss titan being unable to stand. I'd say its definitely the most powerful of all the pure titans seen in the story, but that's only really due to its size.
He knew well in advance that she won't ever use the titan powers as the will would counteract her own. Rod reiss had become a abnornal titan so instead of eating just eren he went after the nearest district cause it had alot more people to eat.
INFINITE HEALTH... 0.05% Royal REISS Family Titan Shift in AOT:R?! ( AOT: Revolution )
Why was Rod Reiss so deformed?
He lacked a face due to the friction against the ground as it destroyed the front half of his head due to his constant dragging as he moved, exposing even his brains. However, if he were to remain off the ground and not dragging his head, he would regenerate a full face in time.
Rod Reiss - Though initially Kenny seemed to be loyal to Rod, being a sort of "right-hand man" for him, it was later revealed that he does not like him at all, believing that he is a coward that only cares about himself, and only obeyed him because he wanted to steal the Founding Titan from him.
After the Rod falls face first onto the wall, Eren transforms and YEETS a bundle of gunpowder barrels into its mouth. After this you may think Rod Reiss is done for, but not until Historia uses her ODM gear to go up and slice up THE nape of Rod Reiss, is he confirmed dead.
His body was totally out of proportion with his torso being very big but his limbs and head not following the size at all, resulting in the Rod Riess Titan unable to walk on its two feet and was needing to crawl and skid itself along on all four limbs.
For one, it could be since he didn't take the serum right with an injury, caused by Historia and the type of serum he took in as he called it, “the most powerful Titan,” most likely a serum to make mindless colossal titans (maybe) since some say the colossal is the “most powerful” Titan, him unable to stand up right ...
In Pure Titans, it was only a spine of the human that was absorbed but in the Nine Titans, it was an entire human body. Without a functioning nervous system to control it, the Titan would die.
This leads to many Pure Titans throwing themselves into situations that could injure them greatly, but with their healing factor, as well as many of them not comprehending pain, this doesn't phase them.
Rod Reiss, often publicly referred to as Lord Reiss, is a major antagonist of the Attack on Titan franchise, serving as the main antagonist of the Royal Government arc.
Witnessing his mother's death was traumatic enough, but seeing countless allies die in front of him was a major factor in Eren's fall to the dark side.
Eren's dramatic change in character came about after he kissed Historia's hand and saw the future, including a version of himself committing mass murder. All Titan Shifters in Attack on Titan have the ability to see the memories of those who held their Titan before them.
If she ate eren, the world would be like “Marley regained the founder, we have nothing to fear” or “now we can just focus on killing Marley” but if eren dies without an inheritor, then people can still fear an unknown outside threat.
He removes his mouth restraint, allowing Eren the opportunity to wound himself and transform. Kenny announces that both Eren and Historia can become Titans and fight it out with peace returning if Historia wins, and nothing happening if Eren wins. Kenny slices Eren's forehead open to help the latter transform.
Rod Reiss may have ingested the serum incorrectly. It transformed him into a Huge Titan who was unaware of his Survey Corps and was significantly larger and more malformed than other titans. One of the reasons Reiss was so well-known was his enormous size.
To spur his father forward, Eren reminds Grisha of his fellow restorationists and Faye, ordering him to finish what he has started. Convinced by Eren, Grisha proceeds to slaughter the Reiss family and steals the Founding Titan, but has also come to fear Eren's intentions and urges Zeke to stop him.
While Erwin plans to blow away her hardened skin with explosives, Levi tells the Titan that he will make her suffer. In answer, the Titan roars, making nearby Titans come to eat its body. The soldiers tries to stop them, but the Female Titan is finally eaten alive, heavily surprising Erwin.
Historia and the Farmer have known each other since they were children. He would bully her and throw rocks at her to gain her attention. Many years later out of guilt he worked in her orphanage in secret until Historia approached him in order to have a baby, later the two have a daughter and are now married.
Since Historia couldn't be persuaded to consume Eren, the task was left to Rod Reiss. However, Reiss chose not to. While it would have been an easy solution, Rod realized he wouldn't have been able to carry on the bloodline. He felt that Eren was key to preserving the heritage and was more valuable as a human.
Historia Reiss - She carried deep resentment towards her daughter. This was mostly out of fear of being executed by order of the council for "shaming" Rod and his reputation by birthing his illegitimate child and being his mistress.
