Aftermath
The butcher let his anger consume him.
Immediately, his body started transforming too. His muscles that were already well-defined became even more prominent as they grew in size. His stature was increasing as well. But there was no muscle rupture or bone-breaking in his case. There was no epidermis falling off. His mana circuits and his mana core stayed stable too unlike the creatures of the wrath.
Eren realized at the time that he was under the influence of anger and mana of wrath. And yet he was still conscious and fully aware of his surroundings.
His unique constitution as a slime half-blood had made the transformation easy for him without losing any of his previous powers.
But the physical boost he had received because of his ability was even more unbelievable. He felt that he didn't need any spell to take care of someone of Claho's level anymore. He could do it with his physical prowess alone.