No.
Spires only
Attack during the
Spires Fire step of the
Turn. Embolden takes place during whatever step of the
Turn it is when it is triggered and pauses the action to resolve the Embolden. Play continues from the same point in the
Turn it was when Embolden triggered, regardless of what step of the
Turn it happened during. If it is the
Spires Fire step of another player's
Turn, after Embolden finishes resolving, any
Spires in range of the newly
Revealed Unit may
Attack it even if they were not previously in range of it.
