Dungeon Seed
Where do you enter it? I haven't got one to hand but I see it a lot and I assume theres somewhere you can enter it to go back to that level and continue from there.
Edit: I'm using shattered so that could be a thing, maybe.
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Just in case, you also must have a win on record, if you haven't won the game yet you can't use seeds
That will be it. I'm a loser through and through.
There should be a gears icon next to the class name when selecting the class for a new game.
I'm also on shattered, btw.