What things did you find in the image that seemed to be important? How could you use them?
Well, there's the "Use what you can't see"
which is the main clue, then also the elements "Fire, Air, Water, Earth"
and the states "Gas, Liquid, Solid"
. Everything else seems to be irrelevant. Also, maybe the "use what you can't see" clue literally means use the blind cipher? Anyway.
How can we use the clues we've found?
Well the elements are related to things like alchemy and witchcraft... Sadly we're not gonna get to talk to ghosts so something related to alchemy seems more likely...?
How can we use the states and elements? Are we looking for URL? maybe a jpeg? We're supposed to use the elements and states in a metaphorical sense... hnnnnggg