The cursed faces of Selenians--or Sublunary men--change as the month progresses.
When "full" none can stand in their light and lie. When "crescent", none can stand in it and tell the truth.
Selenians can root an enemy's feet to the ground or teleport d4 creatures to random locations with a glance.
When crescent, Sublunary men have been known to remove their own heads and use them as edged weapons.
Images: the photo is Peter Lorre, the mini is by Pete Taylor and the painting is by John Blanche.