When Dark Fire gains a Moon/Fire for only a single action (e.g., when playing Elemental Invocation), can it treat that Element as the other?
When Dark Fire gains a Moon/Fire for only a single action (e.g., when playing Elemental Invocation), can it treat that Element as the other?
Yes. That is an Element available to you, even if it's only available for a limited purpose.
This also applies in the rare case that the Dark Fire Aspect is gifted "Elemental Teachings" and spends a prepared Element marker to have an Element for a single action. But it doesn't let the Dark Fire Aspect use Moon markers as Fire markers or vice versa, whether to spend with "Elemental Teachings" or spend for the effect via the Intensify Aspect. (The Dark Fire Aspect has flexibility in the first case only because even though it spends a Moon Marker as a Moon Marker, the resulting Moon Element can instead count as a Fire Element.)
