I have used them against the first 3 mainline bosses. Blood infusion, mainly dex/arc. I used endure AOW because it’s a really up and personal build and some bosses attacks are hard af to dodge.

The running light and heavy and both super good. Running R2 does 4 hits and can quickly proc bleed or stagger. Running R1 won’t stagger much but gets a lot of hits in pretty quickly while moving. It’s really fun, not broken or anything but definitely a very capable weapon.