Eos had been pushing multiple fronts in this game at the start; some were obvious, and others were hidden in plain sight. The Painter was also doing the same, but the crux of the entire game was who could do it better.
Who could win an impossible game with impossible stakes?
The blood of Eos had not just been pouring on the ground for nothing; all of it was on Serathis's substrate, and this had always been the plan from the start.
Eos would make a path where others would follow, even if he had to build that path with his flesh and blood.
The blood had been building a substrate beneath where Andar would stand.
Eos was Telos; he was the ultimate destination for all life forms. When the Painter saw this purpose, to a being like it, all it was was an endless ladder for the lesser life forms to strive towards, but never reach, but to Eos, this was a path, and it was one that he would illuminate.
