Gem Augment. This item gives a small augment to one stat on a gem, and that gem's Power Rank. Used at the Gem Forge. Can be crafted at the Adventurer's Crafting Bench.
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Builder's Rough Focuses are a type of Gem Augment that can be crafted at the Adventurer's Crafting Bench. They can be used at the Gem Forge to give a small increase to one stat on a gem of the player's choice, as well as that gem's Power Rank.