I noticed there was a lack of Blood Kain specific combos, so I went and made some last night!
While in Blood Kain:
1. 5B, 5C, 5D (DC), 214A > 214D, 5B ~ Does around 3100 damage. I can't figure out how to finish it, they can tech way too fast after 5B.
2. 5B, 5C, 5D(1hit), 214A > 214D, 5B, 5D, 214B > 214D ~Does around 3740
3. 5B, 5C, 5D(1hit), 5B, 6A, hj.C, j.D, (straight up)j.C, j.D, 214B > 214D ~Does over 4000.