The Adventure Guide may rule an Action is impossible. Reasons an Action could be impossible include:

• Not Enough Time: The Action requires more time than the length of a Round (see Chapter 12: Encounters for more information on Round length.) For example, trying to forge a sword from scratch in a single six-second Round is impossible.
• Missing Materials: The character lacks the necessary materials. For example, trying to build a ladder while locked in an empty prison cell.
• Not Possible in the World: The proposed Action is impossible in the setting. For example, trying to fly by flapping your arms in a game set on Earth in medieval England.