You must discard as asset from play. Even though you control cards in your hand, deck, and discard pile, there's also this rule:
"Card abilities only interact with other cards that are in play, unless the ability specifically references an interaction with cards in an out-of-play area."
Note that when assets run out of charges, they don't automatically get discarded unless they specifically say so.
- You cannot choose and discard The Necronomicon or Baron Samedi because they 'cannot leave play'.
Revelation - Test (4). If you fail, choose and discard 1 asset you control (if you cannot, take 2 damage instead).
The supernatural cold threatens to freeze your soul.
Core Set #167. Chilling Cold #1-2.
FAQs (taken from the official FAQ or FFG's responses to the official rules question form)
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