Dear readers, the last chapter might've been a little bit confusing, I will try to explain it better in the future.
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A moment after he swallowed, his body heated up to absurd levels, steam came of him through the nose, mouth and even his pores.
His muscles expanded and contracted, his blood became thicker yet flowed faster, his heart beat grew stronger. His claws became sharper and stronger.
His scales became shiner like polished obsidian. His entire body grew much stronger. The effect of the rank 4 black crystal core was much greater than the others, he felt like he was twice as strong as before and there was still one left.
When the process ended he lied down and breathed heavily. The pain was almost unbearable, these cores reminded him of something.
Beast cores, when he first ate a beast core he experienced something similar but to a lesser extent.