Full moons: Strength, Dexterity, Stamina
Waxing Moons: Charisma, Manipulation, Appearance
Half Moons: Charisma, Perception, Intelligence
Waning Moons: Dexterity, Manipulation, Wits
No Moons: Perception, Intelligence, Wits
On an unrelated note, anyone else ever wonder if the God Emperor of Mankind is just a high essence twilight who fell into the well of Udr?