I see Black Fire as a metaphor of what's hard. For example, asking a girl out for the first time would be 'black fire', as they put. The song is about doing what you think should be done, and not being afraid to express yourself. The other message in this song is "to be strong". 'Ride with the steel and the power of the sword, stand up and fight now and forever more. Ride through the night sky with daylight's desire, to be free it must be black fire'. This line is clearly saying: "Do what you think you should, always be strong, work to get what you want, and if you want what you truly desire, you must face pressure (or 'black fire').
I see Black Fire as a metaphor of what's hard. For example, asking a girl out for the first time would be 'black fire', as they put. The song is about doing what you think should be done, and not being afraid to express yourself. The other message in this song is "to be strong". 'Ride with the steel and the power of the sword, stand up and fight now and forever more. Ride through the night sky with daylight's desire, to be free it must be black fire'. This line is clearly saying: "Do what you think you should, always be strong, work to get what you want, and if you want what you truly desire, you must face pressure (or 'black fire').