Shuzu only had a single move and that was her powerful sword swing. Even with her current boosted power, her fighting style had not really changed. The only thing that had changed was fact that now she was stronger, faster and had more killing power.
So at her current strength, there would be little to no chance of any rank 9 powerhouse of defeating her. But rank 10 was a different matter.
One of the reason why rank 10 powerhouses were considered to be broken was because of their super high mastery of the fundamental sources. And even though this lich had not used any rank 10 spell in this battle so far, it's mastery over the fundamental source of Gravity was insane, which was a very powerful fundamental source.
It looked like Shuzu was only cutting the barrier of the lich and was on the offensive, that was actually not the case. So far, it was actually the lich who was constantly on the offensive side.
