i can certify that this crash is dependent on how you can manage your FPS during boss battles.
was able to get through multiple bosses just by making sure it keeps above 10fps
Iām always around 80~110 FPS when playing.
When the Rage Bullets appear, I usually drop to 14~22 FPS.
But that doesnāt matter against some bosses that will actually crash you regardless.
Iāve had bosses that dropped my FPS down to 0.03 and didnāt crash. Only to this blue rage attack that I crash. sad
Thanks a lot, again this exit cancel trick works 100%!! 
Fought a really buggy Bramble this morning but I killed him without bugs tonight. All I did was turn off FXAA and played in window mode. I also stood still when he glowed red and so far no client crash happened. Hope this helps too.
B = boss
Thats the only boss attack that will make you crash ā¦the other bullet attack wont
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I tried this and it works.
- Switch to windowed mode
- Turn off vertical sync
uāre not alone dude 
thats roughly the easiest part of the bosses maybe devs would deactivate it i hope 
Big Tree boss aprox lvl 50 shoot red thingys and even if you avoid them, the game crash, canāt go any further than this one.
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Thatās one of the few bosses that seem to crash no matter what.
I started getting this a couple days ago.
Havenāt played ToS since.
exactly, i saw that pattern too.
I tried turning all effects off and settings to low/FXAA off and in window mode, I stood still a sizeable distance away from Gesti yesterday and she still crashed me.
I got lucky with Bramble (the tree boss) I crashed the first time but the second time I got through, even though he used the bullet attack several times. I think the above poster who showed a diagram of which type of bullet attacks is right, it only crashes on the most intense bullet attack, and usually not on the others. You just have to get lucky and hope boss doesnāt use the crazy bullet.
EDIT: I can confirm that that diagram above is right. I just fought the cactus boss in Zacharial crossroads and every time he used the biggest spread bullet attack I crashed, but every other bullet attack was fine, even with all settings on
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The cbt extend is kinda meh if we keep crashing like this :v
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One thing is for sureā¦
The game has a tendency to crash during Boss Fights once the Boss goes into Spell Card Modeā¦
I hope this gets addressed at some point.
Get as far as you can from the bullets, turn off all graphic settings, turn off vysnc
And if you want to be safe, the close window trick could be used here. Presumably because it doesnāt render the frames that contain RSoD, the Red Bullets of Death 
.
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Iāve tested that turning off soft particle work for me but I have a high-end PC so it may not work for everyone.
People with lower end PC should turn off Bloom, FXAA and soft particle because this error appears to be the graphic pipeline being over loaded when then the bosses use this particular skill.
Edit: This may not work in group play because there is more people using skills which produce more particles.
I was able to get past that Tree Bossā¦
I just stop attacking and run as far away from the boss as I couldā¦
The FPS drops a lot during the āSpell Cardā Phase.
And he uses it as a sort of counter I thinkā¦
Like he would use it when I shoot him with Magic Missileā¦
I also removed my companion during this fightā¦
Turned every effect off and made game low spec mode worked out for me.
Tho i still did not risk hitting boss during arcade shot but i could stay in same screen with it.
Just play in window mode and use the exit button like how we used to login when beta started. Except this time you press exit immediately when the boss turns dark blue and wait for 6 to 8 seconds before you cancel. You must hit the exit button before the boss starts shooting balls and cancel when it finished shooting.
DO NOT press exit too late, DO NOT cancel too early or else it will still crash.
Tried this on a few bosses and no crashes. Though I am not sure if this works on all boss but feel free to try!