These are the new weaknesses you will got for expanding with the Dunwich legacy. New weaknesses make the game so much better, because you can build a whole themed deck and even the weakness will mach now. Let's take a look at the 3 new cards. 

Indebted / A Flaw, permanent (with mean right from the start), you start each game with 2 fewer resources. This card is even for the best players among us a heavy burden. The only solution what we can think of is, that you play with roque because can can soak up and make more money than everyone els. 

Internal injury / Its an injury, revelation put this card in your threat area. Every and of the turn you will suffer 1 direct damage. Take 2 action to discard this card. It's a bummer if you draw this card. But in the forgotten age this is a really cool themed card you can use and make your adventure even heavier.  

Chronophobia / Its a madness, revelation put this card in your threat area. The same as Internal injury only this time you will get insane and every turn ends you suffer 1 horror. This card is so cool to use in the the path to Carcasso because the whole theme is about sanity and willpower. So bring this alone with you.