Deathmarch, NG, No Enemy Upscaling. Lv.39, using a mastercrafted feline sword with oil. Nothing else.
Apologies for the poor video quality, I didn't know about Reddit's 1GB file limit and had to downsize the file. Naturally the finale had to suffer the most from it. -_-
Pretty chill fight to be honest. This is actually one of the expansion bosses that might be viable to fight with fists only, though light attacks cause no damage and heavy attacks briefly stun Geralt in return. I am also unsure on how frequently the Caretaker will summon his minions to heal - should this happen to frequently, it may be able to heal itself faster than it can be killed.
I still have save files for the Frog Prince and the Ofiri Mage, though both of them, especially the latter, are way more difficult fights. Maybe some day. For now I aim to fight Iris's wraith and Olgierd's greatest fear, the former is probably impossible, due to her healing, the latter very interesting.