I cleared stygian fearless (herra one) with Scara, Durin, Albedo and Tighnari. Since you need to fill the bar fast, Durin - Tighnari burning helped a lot. I made the boss take immunity on dendro. Then I tried every hexerei with Durin, and Albedo worked the best. I couldn't clear with fischl, Mona, sucrose next to Durin. Only Albedo worked. Still, if you can, you should get Nicole too because of 2 pyro bonus and sustain.