Tomestones via Duty Roulette: low level - how?

Release notes for patch 2.28
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Tomestones of myth:

Duty Before After
Labyrinth of the Ancients 100 -> 150
Duty Roulette: Trials 40 -> 70
Duty Roulette: High Level 50 -> 70
Duty Roulette: Low Level 60 -> 100
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What should i do to get tomestones from duty roulette duties?
I just now passed roulette duty using lvl 30 class and got gil, xp and seals - no tomestones.

I must join using lvl 50 class or something else?

Only lv50 can get tomestones from low roulette. It's the trade-off to not getting experience.

The myth tome bonus is for level 50 players to entice them to do low level dungeons. You won't get the myth tomes until you reach level 50.

Is it the current class that has to be 50, or is it like GC seals, that once one class is high enough to unlock them, all your classes can earn them?

Current class.

Current class. You have to run it as a level 50. If you run a lower level class you will get the seals again.

Quote:

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Originally Posted by SeraviEdalborez

Current class.

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Yup, it's entirely an either-or thing. If you enter as a class that's <50, you'll walk out with seals and a huge EXP bonus (classes that are <20 doing it could walk out with two levels worth of EXP; and even those nearing 50 will usually get half a level or more from the EXP bonus); if you enter with a class that's already 50, you walk out with a hefty chunk of Mythology.