NB: ArkhamDB now incorporates errata from the Arkham Horror FAQ in its card text, so the ArkhamDB text and the card image above differ, as the ArkhamDB text has been edited to contain this erratum (updated January 2022): Erratum: This card’s Revelation ability should read: “Discard cards from your play area and/or from your hand…” - FAQ, v.1.4, September 2018

Q: Can you discard Clasp of Black Onyx to Corrosion or Realm of Madness if you can't reach the discard threshold with other cards in hand? A: No, in this case, Corrosion would not discard the Clasp, because weaknesses cannot be discarded from your hand except when it is at random. Even if there are no other options for Corrosion to discard, the Clasp would remain in your hand.

Q: I'm helping someone understand the card "Realm of Madness", which says: "Revelation - Discard cards from your play area and/or from your hand with a total printed resource cost of at least X, where X is the amount of horror on your investigator. If no cards are discarded by this effect, take 2 horror." The question came up concerning a Minh type character who would have a large quantity of no-cost skills in their hand. If you have less cost of assets in play, and only "-" cost and skill cards in your hand, does this treachery have the potential to discard your whole hand and play area? A: We talked this over and are making the following rulings:

• Realm of Madness can be interpreted as, you should discard as many 1+ costing cards as possible from in play or hand in an attempt to reach X. If you cannot reach X by doing so, still discard as many cards as you can. As long as you discard at least one, you can avoid taking horror.
• You do not need to discard 0-costing cards for this effect, because these cards cannot count toward X. If all you have in hand or play are 0-cost cards, you may choose to discard one of those to avoid taking 2 horror—you do not need to discard all of them.
• You cannot discard a card with no cost at all (including a “null” cost, “-“) when resolving Realm of Madness.