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Zone into nek castle inside nek forest, within the first room there will always be a ? mark that produces a glowing shard
Thats the important part. Collectables are not as tightly tied to tiers as harvestables. Granted, they follow a general pattern, but regardless of what zone your in, GLOWING shards are fairly rare (rarish, if such a word exists), and are subsequently valuable. Its unlikely one would find one selling for under a gold. If it can be confirmed that you can get a glowing every time, with a zero re-entry timer, then I have to say its might be worth prem. IMHO. Hell, given how easily this could be botted, and the going rate for glowings, this could be a very very nice way to pad ones bank acct.