Ah, good! I've sent the screenshots via email. And yes, I beat the Voidwalker. (I used the Cracked Locket, but I presume one could also chug MP potions to do it.)
That's so helpful, thank you :D
And yeah it is technically possible to do every fight without the "intended Relic combo" (Besides Chimes currently) but that one is especially hard since you'd need to keep up health and MP and chunk in damage when it's safe.
If you have some improved Relics that gel well with the encounter, that allows for a bit more wiggle room.