Warning! Spoilers ahead for Kaiju No. 8 chapter 62!
A weaponized kaiju corpse is affecting a character from the manga Kaiju No. 8 similarly to how Guts had to endure the horrors inflicted upon him by the Berserker Armor in Berserk. In Berserk, Guts takes full advantage of the so-called Berserker Armor he acquires early on in his journey to help him defeat powerful apostles and demons he would otherwise lose against. The armor might be able to provide Guts with such power but there are some major drawbacks.
Imbued with a violent od aka magic, the Berserker Armor instills strong negative emotions such as fear and rage in Guts' mind, causing Guts to lose himself within an almost inexorable berserker state that worsens the longer he dons the cursed item. These emotions become so deeply ensconced in his mind that Guts doesn't feel any pain for as long as he wears the Berserker to the point where, after shattering his bones, he can still move — even fight. Once the armor is removed, however, Guts experiences the full extent of the pain he would have felt originally had he never worn the Berserker Armor, which could result in death.
Related: Berserk's Most Twisted Cult Leader is Being Reborn in Shonen Jump
In chapter 62 of Kaiju No. 8 by Naoya Matsumoto, a character named Reno Ichikawa undergoes a similar experience when donning the deceased body of Kaiju No. 6, which has been weaponized for him to use in battle. Syncing with the weapon causes Ichikawa to experience some serious side effects that are exacerbated by the heat of battle. Rather than fueling him with intense emotions like the Berserker Armor does with Guts, the weaponized Kaiju No. 6 causes Reno's desires and human nature to "bubble up to the surface," culminating
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