Heat Metal

(a piece of iron and a flame)
Target manifactured metal. Make it red-hot. Any
creature in contact takes 2d8 fire damage. Bonus
action on subsequent turns to cause damage again.
Creatures holding/wearing object make Con save
or drop/throw it if possible. not dropping gives it
disadvantage on attack rolls and ability checks
until your next turn.
At higher level
Damage increases by 1d8 for each slot level
above 2nd.