Ritualist (Rit/N) - Byzzr + Chkkr HM Boss Farm

firstly - the 2nd boss ( forget name ) is easier if you switch to 55hp and have necrosis in the build plus consume corpse ( so you can teleport to boss corpse before the mantids spawn.
Never really bothered to farm the sin boss - easier sin bosses time wise elsewhere.
I also think some players may do the 2 bosses seperately as the skillbar has to contend with 2 diff bosses and ip only works on sin boss due to its conditions for use, so it can mean a skill or 2 only gets used for 1 boss and is wasted on the other boss. I'm not sure if you watched the video or not but you can do the boss with 110 health using dark pact since it sacs your health. I also died after the sin boss (which I did first) and that left me at 48 health.

Either way you can live or die and still kill Byzzr since you'll be doing a total of 172 damage to him when you are above 110 health.

To address the consume corpse, you don't need it. It's only for convenience. I swapped my gear to my regular gear and just ran up, picked up my loot and the resigned. You won't instantly die like you would if you had low health.

I'm sure 3 minutes is a respectable amount of time to kill two bosses, especially when there's about a 1.5 minutes of run time, which means each boss is killed in about 45 seconds.