Mutant
The moment Alex's eyes caught sight of the glowing yellow rock, he knew he had struck gold.
'It actually had one! A Mutant E rank beast core!'
It was unquestionable that this was the biggest boon he had ever had the pleasure of finding, and he had earned it all through his own hard work.
He continued to inspect this peculiar looking rock, trying to decipher what made it different to every other beast core he had come across so far, but apart from its distinctively yellow colour, there was nothing different he found in comparison to Ordinary beast cores.
'Well, here goes nothing.'
Since his inspections hadn't borne any fruit, he decided to absorb the core on the spot.
Alex held the Mutant core in his hand and sat down in a meditative position, a habit he had picked up from a while back. He started thinking deeply about absorbing the core, like he had always done with every other beast core and soul orb so far.