The Story of John Warhammer Chapter Two: Primarch Problems
How did the Emperor lose his sons (the first time)
The Chaos Gods stole them
This creature has it's eye on you. All eleven of them.
Beholder
House Targaryen
The Primarch known as the Emperor's Executioner
Leman Russ
House Lannister
Hear Me Roar
The Primarch embodying the Emperor's Psychic Might
Magnus the Red
House Tyrell
Growing Strong
How many Primarch's are there? (Without Inquisitors to change your answer) (counting dead ones)
21
House Arryn
As High As Honor
The Primarch first to be found on the Great Crusade
Horus Lupercal
House Hornwood
Righteous In Wrath