Esteldir's Molecular Excitation

You use arcane pathways between the realms to link a target object to one of the Elemental Planes. Choose a metal object, such as a metal weapon or a suit of heavy or medium metal armor, that you can see within range. You cause the object to spark with electricity, glow red-hot, or flash freeze. Any creature in physical contact with the object takes 3d6 fire, cold, or lightning damage (your choice) when you cast the spell. Until the spell ends, you can use a bonus action on each of your subsequent turns to cause this damage again. If fire or lightning damage is chosen, any flammable objects which are not being worn or carried that remain in contact with the target object for a full round burst into flames.

If a creature is holding or wearing the object and takes the damage from it, the creature must succeed on a Constitution saving throw or drop the object if it can. If it doesn't drop the object, it has disadvantage on attack rolls and ability checks until the start of your next turn.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.