Eren Eats Warhammer Titan | Attack on Titan Final Season Episode 7 - YouTube.
The answer is: protective reasons. Basically,he wanted the power to protect himself.
After the two fought against each other, Eren found a way to take the War Hammer Titan for himself and defeat Porco. He used the Jaw Titan to destroy the crystal that the War Hammer Titan made, allowing Eren to consume Willy Tybur's sister.
In Attack on Titan Season 4, we see Eren capture and eat the host of Warhammer Titan, obtaining it in the process.
After the Great Titan War ended, the War Hammer Titan remained in the possession of the Tybur family, who swore to defend the new nation of Marley as honorary Marleyan aristocrats.
The Attack Titan jams Lara's crystal into Galliard's mouth and forces him to crush it. As the crystal breaks and slices Lara to pieces, Eren has the fluids drain into his Titan's mouth, giving himself the power of the War Hammer Titan.
No,Attack Titan is the strongest Titan of all kinds. Though Warhammer Titan may have some advantages,but still attack Titans Royal blood ability is still unbeatable.…
Placing the diamond shell within the Jaw Titan's mouth and lifting it into the air, Eren crushes the War Hammer Titan within the Jaw Titan's mouth and it leads to a geyser of blood that drips down into Eren's mouth -- adding that power to his own.
In Attack on Titan Season 4’s first episodes, Eren already seemed quite cold, calculating, and committed to the atrocities he must do. While this doesn’t necessarily change after Eren eats the Warhammer, he does seem a bit colder and almost inhuman afterward.
Eren tells himself he must fight, as seen in the Attack on Titan manga. (Image via Kodansha)
In the finale of Attack on Titan Season 4, Part 1, we see Eren heavily lean into this disconnect, eventually severing ties altogether. To finalize this severance, Eren escapes his prison cell and forms an extremist group called the Yeagerists. He then teams with Zeke to make all Eldians sterile, eventually making Eldians extinct.
What happens to Eren after eating the Warhammer is nothing short of a total transformation and abandonment of previous ideals.
Attack on Titan Season 4 emphasizes this change and nuances, as seen in the manga via exceptional voice acting and character animation. Attack on Titan has always been about Eren’s journey, so it’s great to see the anime further illustrate how Eren changes after eating the Warhammer.
War Hammer Titan was one of the Nine Titans, and it was able to construct structures made of the hardened Titan flesh. War Hammer Titan created and manipulated structures built from solidified Titan flesh.
In reality, the Warhammer titan is more potent than even Attack titan. However, the attack titan is just muscles and skin and can harden only whenever he wishes, not the whole body. In the most recent episode, we also saw that Warhammer beat attack titan by a tiny one hit at a crucial spot, and it’s now over for attack titan.
He was the owner of the Attack Titan and the founding Titan. However, he cannot influence or utilize its power without touching royal blood.
In the fourth season of Attack on Titan Season 4, we watch Eren take over and devour one of the hosts from Warhammer Titan, obtaining it as well.
Eren is the heir to War Hammer Titan. After Eren takes the crystal with her new physique, Jaw Titan rushes towards Eren. It unleashes a torrent of attacks using its sharp claws. It accidentally makes a large cut on the crystal as Eren lifts it to defend himself.