I am well aware it is a trial, but if you queue for low level roulette, and get put on say ifrit ,it should still give you credit to finishing content in roulette. I had one week where all but one day I was put in story mode trials
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If you Roulette as a level 50 character you'll get Tomes. If you Roulette as a character that is level 50 in one class, and not yet level 50 in another, you won't get Tomes, because you'll get the additional EXP bonus.
Example: You have a level 50 ACN, but go into Low Level Duty Roulette with a level 23 CNJ, you won't get Tomes.
Still leveling so I don't get tomes, but this past weekend I've been lucking out and getting a string of Ifrits for the low level roulette bonus in xp. I'm probably jinxing myself by posting this but I can definitely tell you that the baby primals do count.
I don't queue on level 50 since the bonus xp is more attractive to me on jobs I have left to level, but they do count for the roulette bonus for tomes if on a level 50 job. They don't count for the challenge log though.