Tyzuris
Primarch to your glory& the glory of him on Earth!
Mine is Corvus Corax with his wraith slipping ability. It's just very cool that he can manipulate other peoples' senses to disappear from their sight and go stealth and attack enemies without them seeing him. And it's not too OP hax like Magnus' powers. For the same reason I like Sanguinius' flight powers and precognition which make him a beast in the battlefield but not too overpowered like Magnus who could telepathically take over half the opposing army and make it fight the other half and enjoy a box of popcorn and six-pack while watching the fight.
Honourable mentions as well:
Lion El Johnson: Cool very near-term precogis-style power that allows him to predict other people's moves in duels to a degree he can change his attacks while they're midway being performed. And also his ability to permakill Daemons is cool.
Perturabo: Ability to learn everything instantly, know how every piece of tech works and improve it instantly. Also his mathematical mind is a logistics boom. If it weren't for his attitude, he could easily surpass Guilliman. With Guilliman's personality, Perturabo would be in short order running his own mini imperium of a thousand worlds and have his own legion of half a million Astartes.
Mortarion: him being the toughest Primarch able to shrug off Baneblade fire to the face.
Horus Lupercal: His analytical mind that is able to identify weak points in enemy formations and deliver decapitation strikes like no other Primarch and Legion.
Honourable mentions as well:
Lion El Johnson: Cool very near-term precogis-style power that allows him to predict other people's moves in duels to a degree he can change his attacks while they're midway being performed. And also his ability to permakill Daemons is cool.
Perturabo: Ability to learn everything instantly, know how every piece of tech works and improve it instantly. Also his mathematical mind is a logistics boom. If it weren't for his attitude, he could easily surpass Guilliman. With Guilliman's personality, Perturabo would be in short order running his own mini imperium of a thousand worlds and have his own legion of half a million Astartes.
Mortarion: him being the toughest Primarch able to shrug off Baneblade fire to the face.
Horus Lupercal: His analytical mind that is able to identify weak points in enemy formations and deliver decapitation strikes like no other Primarch and Legion.