Well, donjon event are actually good event, but lack of prize. I mean, come on, 63 space and 6 treasure... and no thing else.
You could place an card in every space, event though it only a common card. Or a card range from common to rare. So player have a purpose to play, event though they didnt get the treasure.

And please, make the donjon lotery prize up, i mean 3 treasure worth of rare, legend, and event card, but not uncommon.
I use all my treasure only to get and uncommon cards. F*cking uncommon cards which is also the worthless ones.