@Riot - Kassadin's Nether Blade [W] has couple of bugs.

's Nether Blade has some bugs that need looking into. It happened after 8.8 for Cosmic Reaver W visual bug fix.

• When Nether Blade is activated and you try to auto attack; the sound it uses is the default auto attack sound.
• The bug affects all skins excluding Cosmic Reaver.
• The purple visual spark doesn't seem to appear when you auto attack when W is activated.