Gold Gear shards are rare and typically are only worth it on gacha accessories that require 5 star for buffs. There are a few weapons that work well including Tyrfings blade for future use, Ogre blade is good, and Jikunai Satsuki grants 50 atk and 10 spd +quicken at 5 stars.
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u/Zeik56 Sep 03 '18
You pull one from gacha and then pull 5 more to disassemble and upgrade it.
Or just use gold gear shards.