Maybe, their souls are really compatible with each other that it barely took a few hours of practice for them to master the advanced fusion skill, which usually takes a pair of ordinary geniuses about a year to do the same.
However, neither Azzy nor Leah knew of the result of the transformation. So, along with the audience, it was also the first time the both of them saw this appearance of the fusion Arcana.
While it appeared like a high-rank-6 platinum grade Arcana, its true strength is somewhere between mid-rank-7 to high-rank-7 platinum grade Arcana spirit. Not to mention, it can use the soul power of both Azzy and Leah.
The only problem is the control. As the merged Arcana spirit will obey both of their orders, if their opinions clash even on a little strategy, it will be difficult for it to follow the orders.
So, that is why Azzy had already come to an agreement with Leah.