Imperium: Horizons
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When can you substitute resources such as Progress, and must a cost be paid in full?
Best-supported reading from forum discussion; no official ruling or rulebook text settles it.
- q846047679 · Community · 2025-06-19
Substitution is only allowed when paying. If the text is a cost (a pay, move resources, or an X to Y effect), you must fully resolve it or you cannot do it. If it is not a cost, you do as much as you can.