For those who don't know, Nox had to be reworked back in 2015 because her original kit was an absolute mess (how bad you ask? she had an ability that countered her own ultimate). After several tweaks and minor reworks, she eventually got a full rework.
What most people don't know is that before her current kit was finalized, there was a whole other kit that got scrapped and never saw the light of day.
These are all leftover tooltips of that scrapped rework. Her 2nd ability would have been her current 2 (the aoe that silences you if you stand in it).
Edit - Something I forgot to mention: Her ult sounds familiar right? That's because it is Amaterasu's ult, which was originally Guan Yu's ult back when he was a guardian. Nox rework was done in 2015 while Amaterasu was released in 2016. Had this guardian kit come out, Nox would have been the one that brought old guan's ult. back.