I'm using this on a hollow build with a carthus greatsword in the off hand, with claw alongside it for parrying, and it STOMPS. Onikiri has 3 hits on the l1 which means you get 6 for hitting the l1 twice, and true combos into r1 then r2 totaling to 8, and the carthus greatsword being a gs is big boisey enough to not only have the reach on the off hand, but it's able to crowd control,because they're hollow infused though I can buff my off hand, and main. 27 dex rn using Hunter's ring, and I'm also hollow with 23 luck. When I'm not buffing my damage for off hand is 249, and main is 209, and when buffing add 100/150 depending on resin/bundle. I'm lvl 37 currently, and see myself having 40 luck by Irythll. Also occasionally swap the oni with the carthus sword since also got that hollow infused really good since its r1 spam is fast. Also cheesing with a chain, and two plus rings.