Honestly, at the moment, assuming you buy all the 10k shards, you don't need to buy more than 1 100k shard. I've been 1/5 for months and I always end up with 0/5 shards after every DU. If you bought the other 4 right now you'd just have 4/5 after every DU. You wouldn't even get an extra stamina out of it.
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