Enchantment of the Shadow Warlord

You take up your (weapon) and lift it to the moon. You utter a spell and it floats out of your hand with a purplish glow. The ground is covered in shadows and the (weapon) spins in place. There is a low deep hum as it spins faster and the glow gets stronger, the shadows on the ground are sucked into the (weapon). Black Runes are pressed into it's surface and the weapon is dimly lit with a purple glow. The weapon gains shadow and warlord bonuses.