Neutral
Treachery. Weakness

Madness.

Revelation - If there are no card beneath Diana Stanley, shuffle Terrible Secret back into your deck. Otherwise, for each card beneath Diana Stanley, you must either discard that card or take 1 horror. Cannot be canceled.

Ilich Henriquez
The Circle Undone #15.
Terrible Secret
FAQs (taken from the official FAQ or FFG's responses to the official rules question form)
  • Q: How does Terrible Secret interact with cards like Ward of Protection (cancel), Delay the Inevitable (horror cancellation) and Deny Existence (horror ignoring) A: Terrible Secret reads: "Cannot be canceled." at the end of its effect. This means that any card effect which would cancel the card or any of its effects would fail (such as Delay the Inevitable). However, card effects which ignore the horror, such as Deny Existence, would still work, because it is not cancelling anything.
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Reviews

Doesn’t Deny existence only work on encounter cards and enemy attacks? I could be completely misunderstanding part of the interaction or encounter keyword- I’m still learning a lot of the technical side of the game

Skothu · 1
Yes, as Deny Existence states you can only play it on encounter cards. However weakness cards with encounter cardtypes, such as 'Treachery' and 'Enemy' are considered to be encounter cards. You can find it in the glossary under section: 'Weakness'. — Csys · 1
Thanks! I assumed the post was right, finding out why helps a ton with deck building, very much appreciated! — Skothu · 1
To clarify further, weakness cards with encounter cardtypes are considered to be encounter cards AFTER they are drawn. While being drawn, they aren’t encounter cards yet. — Death by Chocolate · 12
So you can actually use "Deny Existence" to cancel all the Horror caused by "Terrible Secret"???? — Alogon · 221
@Alogon No, but you can use it to IGNORE all the horror caused by it. This is an important distinction because Terrible Secrets is immune to cancel effects, so many cards, such as Delay the Inevitable, can’t be used to stop it. Really, FFG should add an FAQ entry clarifying the rules for ‘ignore’ effects because ‘cancel’ is covered in the rules reference and there has been very little to actually distinguish the difference between them besides this one card. — Death by Chocolate · 12
I’m going to assume that there will be errata for this card to also prevent its effects from being ignored (Deny Existence). This weakness is a non-factor with Deny Existence and you almost hope to draw it eventually if you have Deny Existence (5) and Horror on you. — carlsonjd11 · 299