I'm very close to 7* my vader and also need both salvage and full droid caller/scanner as well, the first refresh is 100 crystals, what is the increase pattern?
IMO it is a waste to refresh shard shop. I know that was not your question, but you are spending crystals for a very small chance at Vader shards.
Maybe chance a single refresh
I believe it stays at 100 for the next refresh then goes up to 200 for the next two then in theory it should go up to 400. However, I am unwilling to test this out in the interest of science.
"Everything is proceeding as I have foreseen...mostly"
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Maybe chance a single refresh