Upgrade materials
Add the weapons you want to upgrade, set where each one is and where you want it, and get every stone you need.
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How this works
Each weapon's upgrade costs come from the game's material table: the stone and count for every level, standard weapons up to +25 with smithing stones and somber weapons up to +10 with somber smithing stones. The planner adds up each level between the level you're at and your target, for every weapon you list.