Create Nanites

When casting this spell, you may take the steel bar and work on it for one minute, allowing you to create a Nanite Colony. If you're dealt more than 15 damage in one attack, you must succeed on a spell saving throw equal to your own Spell save DC, and on a failed save, the Nanite colony will break apart, no matter what condition it is in, and revert back into the steel bar it was in before.