Light grind is so mind numbingly exhausting. I just did it for my second relic and I'll have to do it again for my next two (I've got a lot of free time clearly) but I bounce back and forth between hating it more and hating the umbrite step more. Even with the nerf it's still just ridiculous. I think the hardest part about light grinding is you basically do the same thing for hours whereas during the umbrite step you at least can do other stuffs.