Lux E(?) Is invisible.
So I was just in a game(As Leona support, not that it's really relevant lol). They had a Lux support(Using the default Skin) And her E was Invisible when she shot it - No circle around where it landed to show it's range, no glowing orby thingy in the middle, just a shimmer as it passed through minions and the sound.
She was constantly sitting in random bushes and just spamming her E into random places where it wouldn't pass through a minion(Thereby no Distortion/shimmer), making it near impossible to dodge the damage Proc as we had no idea where the shot actually went.
I dunno if it applies to any of her skins, or if it's an every game thing - I just know it happened with her default skin, in the last game I played.