File:Lady Tristana, Mother of Grief (Riposte).gif

Summary
Lady Tristana is a really fun boss fight, and when she uses her flail (I refuse to call it what it really is LOL gross), there is actually a faster strike confirmation / hitbox than the animation may lead you to believe. I actually consider her the easiest Gahar to parry, and it really helps, since she likes to jump around during the fight, and add AOE attacks to her patterns. Every Gahar will be temporarily stunned when your riposte lands, and it speeds up the fights quite a bit.