RL1 Shadowtree Blessing 0 - Rellana

~416 deaths and 9 hours of practicing and tries and I can't even say I've fully mastered the fight.
1:31 - Impaling Thrust here is a risky attack, I've been killed here when she responds with her fastest sword attack
1:38 - I've died a lot of times to punishing this attack when she decides to continue her combo after the cross slash and to that projectile while jumping back as well XD
2:30 - Another risky Impaling Thrust here after the moonlight greatsword spam
2:50 - from here to her death she gave me the same (amazing looking) combo, ending in a cross slash, 5 times. Definitely felt like the game was handing me the win on a platter a little :(
What made this fight so hard for me was:
1) Attack speed/visibility - some attacks I either don't recognise as an attack (mistaking them for body movement) or the movement is concealed by my characters body or Rellana's body. With the swords brightly glowing in phase 2, this was much less of an issue.
2) Distance to the enemy - you have to stay in close enough proximity so she continues her combo's and gives you punishable windows, finding the exact right spacing where you do not get hit, but she does continue her combos gave me so much trouble.
3) Carian Retaliation in combination with other attacks - If she pairs this with the Greatsword spell, Twin Moons, or even just aggressive forward dashing and sword combo's I literally had no solution to dodging both Carian Retaliation and the other attack. I started having some moderate success with just immediately running away when she casts this, but when she casts her other 3/7 sword projectile spell I felt you have to stay in range to dodge all projectiles and her follow up attack.
4) Being RL1 in the DLC means basically everything one-shots you. Especially at Shadow Blessing 0. Ritual Shield Talisman could often let you get away with being hit occasionally in the base game. Not in the DLC. Having to basically beat a boss hitless makes it a lot harder for me.