#desolate dive 7

using 112 rotation for phase 2 is a good safety strat if you really need to avoid taking hits here, if you get fake dives in any of the first 3 dives your kill is pretty much on par with the riskier wall strat. timing on the jump is important to get the shade souls off regardless of whether he fake dives or not in some of these scenarios

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.

Strats for Soul Master p2 with a 2 soul start.
The first is a dmg tank that gets you a 15.0s kill, but is very easy to mess up since the timing is tight and he can easily i-frame your 2nd shade soul if you're not careful.
The second is a much easier dmgless version that gets you a 15.5s kill

Several different strats for Soul Master p2 with a 1 soul start. The first is 15.8s for guaranteed dmgless.
The 2nd and 3rd are rng to get hit, 15.5s if you don't, 15.8s if you do.
The last two show good backups for fakedives. 15.9s if you get one for the first attack, 15.0s if you get one for the 2nd

better dmgless Soul Master p2 strat for a 0 soul start, 16.3 second kill. This is the same speed as the dmg tank version that gets a shade soul off before getting hit

Better strat for the dmg tank fast kill on Soul Master.
Saves 0.4 since you get to skip a cast after the dmg tank.
You wanna cast right before he spawns, not too difficult to time with a little bit of practice if you have a good feel for when he starts a new dive.
Try to lean towards being late rather than early since you can just back it up with the normal strat if you're late and don't get the cast off.
This strat also allows you to do a nailcancel after the dmg tank if you missed one of the earlier hits. (Just make sure you don't nailcancel too fast because he will i-frame it)

new soul master phase 2 quick kill. doesn't require damage tanking, which is good.