Rowan wanted bigger, his bloodline demanded it, and his potential expected it.
Of course, that would mean the energy required to power it up would increase exponentially, but energy was the last thing that Rowan lacked. His Primordial Sea of Darkness could power an entire galaxy, not making use of it was wasting his great advantage, he doubted anyone else below the gods had the amount of Aether that he controlled.
To begin creating Apollyon, he had to begin from its core, and to create the Core, it was incredibly simple, yet also complicated. Simple for him, but unreachable for most.
Rowan began organizing the creation process inside his mind and time slipped away, day by day, he was lost inside Knowledge Well, running calculations every second that Andar at his current level would have to do for centuries.