i just use them as i learn them. the first guess is 33% chance to be right and if it’s right the next becomes 50% chance so the thing there is it’s either gonna be level 2 if you get it right or 3 if wrong. if the 33% fails then that becomes level 3 or 4. at no point should your lichsis ever become level 5 unless you fucked up or guessed the requiems entirely (which you shouldn’t do). the speed at which you get murmurs ensures that you will almost always have a new learned req before the murderhobo shows up to wreck your shit.

frankly, the best use of oull is in timesaving by using 3 at once to fully stab your lichsis at level 1. because learning murmurs is way too easy, it’s nearly impossible to justify using an oull requiem on its own.