Your knight holds Final Flourish in their hand, even in Haven. This acts as a shield, in spite of clearly being a sword.
Stats I would like to see are as follows:
No normal resistance.
Piercing resistance, equal to barb thorn shield's piercing resistance
Poison resistance, of shield resist value
Sword CTR med
Global asi low
Bomb ctr low
So, is this like the Dark Soul's parrying dagger?