You point to a spot on the ground within range, creating a circle of runes with a radius of 30ft with the spot you pointed at being the center. When you do so, you choose either the Attraction or Repulsion property.
Attraction All metal within the circle is immediately pulled in a straight line as close as possible toward the center of the circle, including armour and weapons. Any creature wearing metal armour that is pulled in this way must succeed on a Strength saving throw or be knocked prone.
Repulsion All metal within the circle is immediately pushed in a straight line as close as possible toward the outside edge of the circle, including armour and weapons. Any creature wearing metal armour that is pushed in this way must succeed on a Strength saving throw or be knocked prone.
* - (a lodestone)