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=== [[Marley arc]] ===
[[File:Reiner attacks the Allies.png|thumb|left|200px|The Armored Titan assaults Fort Slava]]
Four years later, Reiner is present at the battle of [[Fort Slava]] at the climax of the [[Marley Mid-East War]], waiting on standby in a zeppelin due to the presence of [[anti-Titan artillery]] on the ground below.{{ref|92|p = 2}} Once the ground infantry succeed in destroying the armored train carrying the artillery around the fortress,{{ref|91|p = 35 - 37}} Reiner eventually joins the combat as the Armored Titan after a Titan airstrike sent down with the power of Zeke's Beast Titan. Alongside [[Porco Galliard]]'s [[顎巨人]], the Armored Titan decimates the anti-Titan artillery set up on the walls of the fortress.{{ref|92|p = 28 - 32}} When the coast is clear, Reiner's Titan signals for the Beast Titan to join the battle, where it throws spare artillery at the [[Mid-East Allied Forces]]' navy stationed in the bay nearby. However, when the ships begin to open fire on the Beast Titan, Reiner uses his Armored Titan as a shield for Zeke, receiving devastating damage in the process.{{ref|92|p = 45}} Despite having lost his entire body below the head in the explosion, Reiner later recovered.{{ref|93|p = 21}}

One month later during [[威利·戴巴]]'s speech in [[雷貝里歐]], [[法爾可‧葛萊斯]] takes Reiner to a basement behind the stage, where he meets [[艾連·葉卡]] for the first time in four years.{{ref|98|p = 43 - 45}} After Eren sets aside their differences and clarifies that Reiner is not his true enemy, he takes Reiner's hand and begins to transform.{{ref|100|p = 35 - 39}} In a state of panic, Reiner bites his hand to transform and protect Falco. He creates two armored hands that successfully shield the two of them from the energy blast and resulting wreckage. Reiner is unconscious following the attack and his injuries do not regenerate. Falco suspects this is due to Reiner having lost the will to live.{{ref|103|p = 1, 7 - 9}}

[[File:Reiner awakens to fight Eren.png|thumb|right|200px|The Armored Titan without its namesake armor]]
As the Survey Corps and Warriors battle in Liberio, Falco and [[賈碧‧布朗]] cry out for Reiner to save Galliard's Jaw Titan, which is about to be eaten by Eren's [[進擊的巨人 (巨人)|進擊的巨人]]. Reiner reluctantly wakes up and transforms into an incomplete Armored Titan, which is missing much of its namesake armor.  The Armored Titan manages to free the Jaw Titan, but is unable to stand again after the Attack Titan punches it across the plaza.{{ref|103|p = 32-43}}