Favorite fractals : Chaos, Nightmare, SnowblindLeast favorite : Swampland, aquatic ruins, solid ocean. Without the last boss Siren's reef is a little like Underground, lots of mobs, one little boss in the middle with a kind of specific puzzle/mecanisms inside.For the last boss, the base is also a mix between mecanics and mobs management, but the Massiv waves of trash mobs are almost ridiculous here.I agree level of the boss is not a problem but the visual cluster is still a real one. Even if u have the "perfect team". Im not fan but i dont hate Underground, even with ice boss. It can be done without getting a headache. Twilght Oasis have some issues with visual effects too, but not like that (and we got the special jump to avoid AoE + breath a little). Sirens boss we cant breath, sometimes we cant see (mobs or wind) and even if artillery phase can be a good idea, sometimes we cant use it proprely coz of the mobs, birds or other instas. There is some good ideas on this fract, but really because of the mobs zombie invasion, i'll continue to avoid it entirely.Or i'll go in T1/T2 sometimes, if new players survive.. thats all.