Keep backstabbing him. His moves can be easily dodged by just walking sideways. 23 isn't that low. Dark souls is more weapons than level. wait for him to attack, side step, go behind him and backstab, for the ones that are newbies to make things faster grab any weapon with bleed effect and have fun.
The Pursuer (呪縛者, Jubakusha) is an optional boss and later an enemy in Dark Souls II. The Pursuer is a mysterious figure who relentlessly hunts the Bearer of the Curse. The Pursuer tracks the Bearer to the Forest of Fallen Giants, The Lost Bastille, the Iron Keep and lastly Drangleic Castle. The Pursuer is a large hulking knight who hunts down those who bear the undead curse, possibly to
Rolling backstabs are easiest on greatswords or slower (ultras). If you watch a rolling backstab, you roll into an attack to end up behind them (the roll has to be spaced to end up super close), do a 180 while getting up and go for the backstab. If your timing or spacing is wrong, it won't work: if you watch chasethebro from 5 years ago, he
This is the best backstab any souls game had by far, truly the best of both worlds. Happy to see that from finally came up with a solution, you know what I think ? This is thanks to that awesome guy that worked on dark souls 2, that guy who really listened to the comunity and made PVP a priority (for better or worse).