I see it has not been posted once so far so here I go.

The Boss Blitz Boss Songakshi is currently bugged, effecting mostly Calamity level 7 and 6. With the attempt at a bug fix this last September, a new attack pattern was created, one shotting players with no warnings.

1) Have Songakshi in her regular attacks (knife strikes, melee etc)

2) Suddenly, no prior warning, she will do a sort of square / box AoE in front of her, looking like a rectangular Black Wave.
3) After less than 0.3 seconds delay if you remain in the AoE, you take MASSIVE damage, immediately 1 shotting you.

4) No red box warning, in-between her auto-attack and done extremely quickly with little tells.
5) It happens at any phase of the boss. From the start to the end

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Do note that she is also still desyncing and lying on her face direction after ghosting out.

I don't think it is a bug, but it is definitely her most annoying attack. It is the one she uses randomly throughout the fight, but 100% of the time after she says "Why are you hurting me? My only sin is eternal love." or something, after which she spawns in after ~3 seconds and launches a one-shot ability. My only complaint about it is that the animation and the damage aren't paired up, where it hits as soon as she decided to use it, but the animation plays .5 seconds later. You basically have to predict that every other attack she uses is going to be that one-shot and never commit to any combos or long skills.