Jason Kharo
Can you explain in First Heretic which order the Primachs go in? I can guess some of them however.
The first is the Lion, the only Primarch to land on a world truly tainted and infested by the powers of Chaos.
Second is Fulgrim, who landed on Chemos.
Third is Perturabo landing on Olympia.
Fourth is Konrad Kurze on Nostromo.
Fifth is Angron making a traumatising landing onto an unknown world.
Sixth is Mortarion who landed on a world whose name I can't remember.
Seventh is Magnus landing on Prospero, with both eyes still intact. He would not give up his eye and become the Cyclops until he found his Legion and the curse it carried.
Eight is Horus landing on, ho-hum, that moon I can't remember at the moment.
Ninth is Lorgar, who has been held in the Warp far longer than any other Primarch.
The last pod is one of the two unknown and slain Primarchs, as the contents are revealed to be mutated and tainted beyond recovery. It should be noted that while the Word Bearers are there, so is Horus (see: False Gods), who cracks incubator pod II. He is also the one who sees the red blurr (Argal Tal) lash out against the containment systems that keep the pods hidden from the Gods of Chaos.