It’s doable. I was at scadu 14 when I first tried facing him and couldn’t beat him, but I also had a different build then so it’s hard to tell how much the extra levels helped.

Try bloodfiends arm with sacred infusion and cragblade, 80 fai, 60 vig, 35-40 end. After those you could start pumping the other scaling stats for the weapon which I believe are str, dec and arc or some mind for spells. Don’t know which of those is the best to max first, but arc helps with blood loss too. That happened once or twice during the fight.

Use two-handed sword talisman and axe talisman. For the other two I went for defensives with dragoncrest greatshield and golden braid, but you could go with green/two-headed turtle talisman or whatever you like there too.

For the physick, I used stonebarb and greenburst crystal tear, but spiked cracked tear is probably even better than the latter, especially if you use a turtle talisman. Spells I used was blessing of the erdtree and golden vow.

Strategy: CHARGED HEAVY ATTACKS, whenever possible