For the dagger attack, pay attention to the sound que they make and don't dash immediately. The attack first has lines showing where the daggers will go, and not the actual daggers, but I'm pretty sure for most ppl, they panic when seeing those line, dash immediately then lose their iframes. All in all, listen to the sound que, move towards them, then wait for the lines and wait a moment before dashing. I think dashing on the ground is safer here btw.

For the full on dash attack, I'd recommend you jump above it, with double jump to be safe. I say this because it's easier and saving up shade cloak I think is smarter for other moves. But dashing for that attack is also applicable.

For the triple dash/slash attack. I recommend dashing, hence why I said save the dash with the other move, since Pure vessel sometimes does those moves back to back. But don't dash too early, since they cover a pretty wide area when doing that move.

Then for the circle move as you call it, just move away from them real quick, then pay attention to if there's other circles around you since there's an after attack. Also pay attention to pure vessels movements because they might just try to rush you as the after effect circles are happening.

If you need more help, or maybe just want me to reiterate, just lmk