Solaris was still unable to fuse with him as Artemis and Petri, and if Jason were, to be honest, he was unsure why.
Petri's soul connection was not as firm as Solaris' after all!
Nevertheless, the strong soul conjunction of Solaris gave him several advantageous effects even without fusing together.
With an extremely low mana consumption, and the ability to control its flames however he wanted, Solaris was able to turn Jason into a glass cannon-like being, with strong attacks, yet weak endurance.
There was just one important factor that made him different from a normal glass cannon while allowing Solaris to occupy his mana core- he was not restricted physically.
His physique was still strong enough to be at par with Prisma stage beings as long as he used other amplifying factors, which meant that Jason was, in fact, able to deal significant damage to others while having high defensive capabilities!