In addition to being a theming failure (@fistofyogsothoth covered this nicely already), this card was already too strong when abused alongside recursion effects like Scavenging or Library Docent, or with any of the other obnoxious combos people have already reviewed nicely.
With the Drowned City gator cards being released, the possible combos for this card have gotten even more disgusting: enter Library Pass. Combo this with Scroll of Secrets and now you can, with ZERO REQUIRED, do the following:
- Put Necronomicon on Library Pass
- Use all 6 charges (often just grabbing 2 clues for free, or doing 3 free damage and drawing 2 cards)
- Don't pay the 1 resource and let the book go to the bottom of your deck
- Use Scroll of Secrets(3) during any window between now and the start of your next turn to put Necronomicon back in your hand (and maybe throw away a weakness while you're at it)
3 rotations of Necronomicon not enough to break the scenario? No problem, recur your Scroll with Library Docent, or put more secrets on it with Eldritch Sophist (or any other secret-adding card), or use Ariadne's Twine.
This card needs to be taboo'd differently; until then I will not be playing it unless I'm in the mood for a free campaign win.
There are a few interesting ways this could be balanced. Perhaps something like
Cost: 10r
This card costs 1 less resource for each horror on your investigator
FORCED - When you play this card, take 2 horror
I'm also partial to the suggestion that you add a Madness to your deck when playing this. Dark secrets have dark prices!!