Am I reading too much into it?
http://ddragon.leagueoflegends.com/cdn/img/champion/splash/Mordekaiser_0.jpg As you may already know Mordekaiser's ensorcelled Mace is called Nightfall and is used to channel some of his necromantic potential.
So, thinking about that and taking a look at Morde's base splash art and overall vfx's of gray, blue and red hues I've come to notice that it's the primary color scheme of your typical dusk. https://www.casainitalia.ch/chameleon/mediapool/thumbs/b/3a/sunset-villa-003_820x600-ID24238-ad5cde5c3b47d5a2751cee9dfb539aef.jpg
So, is this just a lucky coincidence that Nightfall is followed by necromantic displays of power that mirror what comes before the setting of night or is this intentional?