In one gulp, Emeros drank the blue potion. He did his best to not waste even a drop so that he could maximize what he would remember.
Many scenes began to appear as if the days of Kyros and Noxus flashed out. There were numerous days in Kyros's life when he 'learned' much. In Kyros's past life, Celestial God Daradiel taught him much about how he could surpass his current limitation. When he died and was transported, there were the years that Calaminus lectured Kyros.
But the day of Calaminus's long lecture was too unpredictable. The issue was that Calaminus would spend hours talking about useless things like search engine optimization and the DC comics continuum in an event called Crisis on Infinite Earth. While there were nuggets of gold in that, Emeros had no time to scour through the exact moment of time.
The Blue potion could bring him to a memory he sought, so instead, Emeros chose the day when Kyros read through the books in the Library of the Nephilim.