
This has been updated to match my "Signature Weakness Project." I have done my best to make sure that the original content isn't altered too much, out of respect for any comments.
Another Enemy weakness!. Looking at the two elements, the effect and the discard condition, we get:
The effect: Jenny likes resources; it's kind of her thing, and this weakness shuts resource generation beyond the means of the plebes right down. The 4 combat and 3 health make the Beast likely a 2 action roadblock, and a non-combat Jenny can struggle with it. It can be handled by other investigators, which is a plus, and it's not much of a challenge for your average Guardian (or even Miss Barnes under most circumstances). Like Searching for Izzie, a lot depends on when you draw it, although the situation is reversed for the Beast. Drawing it early will ruin your day for a bit and require addressing; drawing it late in the scenario often means you can just ignore it, and the size and shape of the map have a big effect on how easy it is to reach. Mitigating this card requires the usual range of combat options. Getting to the Beast's location involves the typical tools of Elusive and/or Elusive. Jenny could use some of her precious off-class slots on Vicious Blow (to try and take the enemy out in 1 action) or "Get over here!" to bring the Beast to her.
The discard condition: Get to it, and kill it.
All in all, this is an average signature weakness, maybe below Average in multiplayer with a strong monster hunter.
Box vs book Both assets can be replaced with faction cards and are merely good, not fantastic, while both weaknesses are pretty bad, with the Beast being slightly easier (especially in solo), so players might well chose the "book" set over the "box" set, and I doubt anyone will want to take both.