Extremely consistent soul warrior quick kill that saves 1.2 seconds compared to the best rng with the current strat. Needs full soul, but in my experience I usually have that here already.
The only trick to it, is that you wanna jump up a bit before you dash, at the same time you hit the soul warrior trigger (The trigger is at the tip of the arrow shape on the ground, look under where I jump). That way you can shade soul as soon as the dash ends.
You can also upslash before the dash if you're 8/9 soul, which is useful if you doubled the soul twister and then get up to 8/9 from the shade soul jar
You end with 0 soul instead of 4, but you can easily get enough soul before soul master in less time (for instance the soul jar in hell room costs 0.3).
The current strat very often loses more time too, like if one of the shade souls don't double, if it teleports to the left side of the arena after the opener, if you get hit, or if the geo spread is awkward.
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