it is in the Castle Trodain dungeon, which can only be unlocked after you get the key from the lady in the snow area.
You are given them on acceptance of Quest 178, started at the grave at Brigadoon, in the north east of the ruin.
You Alchemise them with one piece of Orichalcum, and 9x Glass Frit.
It takes 9 pieces of Glass Frit, and 1 Orichalcum.
The metal is getting rusty!
Alchemise it with 1 piece of Orichalcum and 9 pieces of glass frit, to make Erdrick's Sword. There are other Rusty items in the game, all can be restored into Erdrick's items in the same way. You are taught the recipes by one of the DLC quests, and receive the Rusty Gauntlets from it too.
There are a few, yes, but they are rare. The Rusty items can't be replaced once alchemised, those are about the only items you can't get more of.
A RUSTY METAL FRAME WILL HAVE NO EFFECT AT ALL ON your garden produce
quest 177 : Quest #177 - Tones of the Bones Location: Wyrmtail; Skeleton in cave Request: Bring him a Bone Chimer. Solution: Defeat Blight Knight (#237) in a high level Ice grotto with a the Hammer skill, Heart Breaker until he drops the item. Reward: Rusty Armour; Saint's Ashes for repeat Pre-req: DLC, access to a high level Ice grotto Repeat: Yes
This metal is iron.
it's because the axel is rusty
stainless steel
copper copper