Cthulhu: Death May Die

When can a discovery card be used? Does it require an action?

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Using a discovery card doesn’t require the Investigator to use an action. If it’s not specified when the investigator may use an effect from a Discovery card, it may be used anytime during their turn. However, it cannot be used while resolving another card, effect, or during a roll. This includes, for example, being attacked by an enemy, resolving an action and end of turn effects. You may not use while resolving them but may do it before or after any of them.