crecentia, in my opinion, at ml40 need a re-build skill, with that skill reset scroll i mean.
you cna choose what you prefer to use STR or INT based crecentia, soem crecentias uses 50/50 each stat. in my case i go full int, cause i love to spam death grip skill.
at 3.000 vigor you have around 73% cooldown reduction, and you have unlimited awaken darkness, so you can use always death grip, land of darkness is a skill which you can overlap, spammin it, it deal each 2 secosn 1 hit, but if you spammen more than 1 land of darkness, each land of darkness overlaped will hit too, so, its pretty usefull, i use land of darkness inc ombination of earth worm for example, so you make all get 1 stigma point, and LOD now hits 50% more damange...
for normal attak i used to use crucio (now not longer, but thats only my case), furnunculus is your main DOT skill, very usefull at high end levels, specially for bosses, raw tilt is a must for crec, blindness skill onyl if you want, i do soemtimes solo bosses, and i feel that it helps me a lot, contigency is a cool skill too, as support crec, its a must, as main crec, you can skip it, since you will spam death grip instead, levicorpus s for me a must, and in my personal case i dont use imperio, other crecs do so, just up to you
and...... you can use if you want that stigma mastery 5/5, i just putted 3 pints on it, to make sure tempest hit better critical, in my opinion brahm gush is useless, since it not always hits the target, its a bit bugged cause, idk why, but it just doesn thit the mosnter, it even doesnt show "miss" its just, the strike dont reach always, so i skipped, you can use illusion blade too, i love it too in combination with earth worm, and well thats rpetty all i could say, all others are physycal skills, i never tryed to go full str on a crec, but has to be funny too
good luck guys
PS: evanesco, if you dont really kill boss, i woudl use it, cause for grind, its pretty useless sicne the mosnters doesnt hit you sooo hard