Am I not able to buy it with marks or not to get infusable one instead of having it at 160?
Kinda sounds like a dumb question but I got it and assumed i could get it with legendary marks but it's not showing up so just curious
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Unfortunately the only way to get the year 3 thorn is through a quest from doing Shiro's bounties. You may get it after one bounty or it may take you months of bounties.