The blacksmith's heat metal spell allows you to blow on a piece of heated metal, causing it to become a weapon. The blow is not directly magical; it merely causes the metal to warm up so that it can be quickly shaped by a blacksmith
The spell does not cause any damage to the person who is doing the shaping. However, if you are an unarmored or lightly armored character, you will probably suffer some damage from the heat wave caused by your blast
The spell does not work on cold or frozen objects, such as statues or wrought iron.
forge cleric heat metal