[Skin Concept] Blackfrost Karthus

*As fate would one day have it be so, Ekko and Zilean; two manipulators of time, came to find themselves on opposing sides of battle atop the Howling Abyss. Using their wits, skills and techniques the had a mighty clash. However, just as time and space are said to have never meant to collide, neither should time with time. *

The distortion caused by Ekko's Z-Drive while Zilean was chronoshifting to save himself tore open a hole in the fabric of reality. From this hole an alternate timeline was shown to Zilean and Ekko, a time when Lissandra was victorious in her battle against Avarossa, and the watchers ruled Runeterra. In the world being shown before them, Karthus sought out the watchers, so that he could gain enough power to live and unlive for all eternity and watch the death of every single being unfold.

As Zilean's chronoshift completed he found himself looking at Ekko. But Ekko was not looking at him, instead he was looking at the Ice-riddled Karthus, who crossed over from the other timeline.

Note, i simply found the skin concept, i just thought it would be interesting to post it here with a nice little bit of lore to go with it.