Even though he didn't know much about the Nightmarescape or the Land of Beginnings, Cassius knew enough to understand that Yuna's progression speed was insane.
The Vice Fortress Master, for example, was well into his 30s and yet only at the 2nd Stage, 2nd Class Slayer Rank. Furthermore, this was accomplished with his far above-average Slayer talent and many years actively defending the Mistalore Defense Nation against invading Nightmares.
And yet, in a meager couple of weeks, Yuna Mistalore advanced not just a single stage but two! Furthermore, to top it off, she was at least a fourth of the way through her current stage. This meant she wasn't too far off from another breakthrough!
