Rune Achievement in God Mode

Mages are floating enemies in silver shining armor. They launch out runes every once in a while which will be placed on the floor and be the same color as the Mage that used it. All you must do is purposefully walk over top of them until the achievement pops.

If you are unsure what Mages are or what they look like, you can visit the bestiary in the main menu and see them.

Seals stepped on during the "Trap" Test of Faith will also count towards this, so if this test shows up, make sure to take advantage of it.