Horus vs Big 4

Not Dorn nor Vulkan, Sanguinius nor Jaghatai would beat Horus, not now that his ascension was almost complete. Together? Perhaps. But Horus, for all the weakness in his soul now exposed, was not a fool. He had always demonstrated the ability to set the field to his need, making victory look easy. The challenge was for one alone, the one that made him.

Heralds of the Siege