Adam, as one of the strongest K1-Phantoms at the moment, gained his position largely by defeating Essence Thunder Demon, a Top-2 Monster.
That was why, even a Phantom like Erla felt as if she was a fan in front of a celebrity, even though she was strong enough to kill Giant Rogo, a Top-18 Monster, with a single accurate attack.
It was worth remembering that K1-Phantoms started from Blue Threat Level monsters, then they progressed to Purple Threat Level and gradually reached Top-100 monsters. Each successive monster defeated was proof that the Phantom's power had increased.
However, Oskar's words were able to interest or even slightly scare Katrin and Adam.
A monster stronger than the Purple Threat Level? Sure, there were more than enough of them, but they should be in territories for K2-Phantoms such as Prago.