The first thing that Zhao Xu saw was his new stats:
[ strength: 8(-1) ]
[ agility: 13(+1) ]
[ vitality: 14(+2) ]
[ intelligence: 23(+6) ]
[ perceptive sense: 25(+7) ]
[ charm: 25(+7) ]
when he combined with altoria, artoria's intelligence, perception, and charm were all deducted by 5 points each and compared to zhao xu's. the higher one's attributes were, the better it was.
This meant that if Zhao Xu wanted to inherit the last three attributes of Artoria, he would have to suffer a penalty of five attribute points.
However, he had just used the 'clarity enhancement', a' coherence 'specialty, which could exempt him from the 5 attribute penalty.
and so, zhao xu had perfectly inherited the last three attributes of his opponent, and they had all evolved to a level that he had never touched before.
This was when Zhao Xu's will, immunity, and extra spell slots were all increased by the same amount.