How do you beat Oni ? I think I've tried all moves available to that point (3rd level, or so) and it doesn't have any weaknesses.
Oh, and Slime and Tengu weak to Cannibalism card (Sadism damage with red color) from Oni too
(I would like to suggest that if you got the new card just replaced it with a Hypno hole card and Untie card 'cause you don't need it!!! and you can change Dick slam card with the Flex pecs since it's the same type of damage ;w;)
How do I even get that Harden card from Tengu? When I choose the first option in dialog, I get some useless Untie card. Any other option doesn't give a card. Plus, there are very few Tengu enemies before I meet first Oni, so there is a high chance that I don't get anything from Tengu before I meet the first Oni (which I can't bypass).