Thermal Flux

make a ranged spell attack against an object no larger than 5ft in any dimension or creature that you know the position of within range. On a hit, you manipulate the target's thermal energy, dealing 2d4 + 1 fire damage to the target.  

By repeatedly casting this spell on the same target you continue to increase the temperature, liquifying iron in under 1 minute (20d4 + 10 fire damage). Alternatively You may cast this spell as a ritual, dealing damage equivalent to casting this spell over a 1 minute period (20d4 + 10 fire damage).

This spell’s damage increases by 2d4 when you reach 5th level (4d4 + 1), 11th level (6d4 + 1), and 17th level (8d4 + 1).