Spark of silence

I am wondering what the spark of silence will be used for. I have been getting these drops for the past week or so more often than sparks of inception but don't know what to use the sparks of silence for? Could anyone enlighten me as to what they are used for.
Comments
I will give one exmple, though all are the same:

http://dragoneternity.com/library/magic_earth/
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