Higher smithing skill allows you to learn higher level smithing plans. Blacksmithing plans can be found on trainers around the world as well as from quests and monsters.
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Coarse WeightstoneKnown
Heavy WeightstoneKnown
Rough WeightstoneKnown
Copper Chain BeltKnown
Copper BracersKnown
Heavy Grinding StoneKnown
Iron Buckle×2Known
Bronze WarhammerKnown
Golden Skeleton Key×2Known
Copper RodKnown
Golden RodKnown
Silver RodKnown
Sharpening WheelKnown
Runed Copper BeltKnown
Copper Chain PantsKnown
Copper Chain VestKnown
Rough Copper VestKnown
Gemmed Copper BootsKnown
Strange Copper BootsKnown
Rough Grinding StoneKnown
Heavy Copper MaulKnown
Silver Skeleton Key×2Known