The warrior dream bosses in P5 do more to wear down my mental than anything else in the entire run. They aren't hard, they're just annoying and I feel like I'm being worn down into playing impatient and then failing in my platforming effectively throwing my health away for harder fights.
No Eyes is the #1 culprit since I view her as nothing more than a glorified stage hazard that seemingly teleports every single time I hit her. Markoth into Zote is just cruel with the combination of Zote's unpredictability and Markoth wearing down my mental with awkward platforming and his tendency to hide underneath platforms.
Certain boss fights do the opposite like the Sisters of Battle of the Grimm fights but I'm pretty neutral on most so getting to those peaks to reinvigorate me is what I'm pushing for.
I've made it to Absolute Radiance one time and almost beat her that first attempt but failed in final phase and more often than not my runs die at Zote from being worn down and playing impatiently.
I just need to try and recalibrate my mental and not allow it to bother me...