Heat Metal A5E

The target becomes oven hot. Any creature touching the target takes 2d8 fire damage when the spell is cast. Until the spell ends, on subsequent turns you can use a bonus action to inflict the same damage. If a creature is holding or wearing the target and suffers damage, it makes a Constitution saving throw or it drops the target. If a creature does not or cannot drop the target, it has disadvantage on attack rolls and ability checks until the start of your next turn.

The damage increases by 1d8 for each slot level above 2nd.