Most of the Regis Elites were already Grand Masters, with a few already half a step into becoming Exalted. Raya and Myst were among the latter, and with Ames's assistance, they were able to break through without a problem.
As an Exalted, Raya's capability to replicate a scene through his innate magic improved by leaps and bounds.
Previously, when he was still a Grand Master, he could already pick up the magic energy coming from a peak Magus. Now that he was an Exalted, he could already pick up the magic energy of Legendary.
However, that was not enough. As a matter of fact, even if Raya broke through to a Magus, he would likely only pick up the magic energies of Sovereigns, and clearly, The Emperor, who was chasing after their young master, was not one.