[Whatever]

Spell Name: Allomancy
Magic Tree: Metal magic.
Mechanics: Toggle-Buff. While having ore in your inventory you are able to 'consume it' (quite literally) then burn it using your mana, acquiring an empowerment based on the ore type. Adamantite could reduce damage, Orichalcum could empower magic damage, the likes. Ore would need to be continually consumed to keep the buffs going, necessitating a hearty supply on hand at all times. Similarly, toxic metals can still be consumed, as the spell itself would degrade the metal in its entirety, preventing the toxins from being absorbed by the body.
Visuals: An aura effect depending on the ore consumed, I suppose.
Other: (optional)