One of the theories surrounding Lerasium, that when it’s alloyed with another God Metal, they created a new Metallic Art. A mix of Preservation and another Shard, similar to Feruchemy.
How do you believe these new Metallic Arts would function? Not what individual powers they grant, but how they use the metals.
Preservation/Endowment: The user can Invest a metal with a power, which power depends on the type of metal they Invested. They then gift this metal to another individual for them to use, since the Invested person cannot use the metal themselves once Invested, because the Identity inside the metal locks them out. However if the user is also a Feruchemist, they can blank their Identity while Investing a metal they can then use the power within. If they practice the other Metallic Arts, they can Invest the metal with abilities from those Arts( Mental Speed, Steelpushing).