Kassadin Skin
A opposite to the choosen Master Yi Skin= Darth Kassadin 
, the sword is now an Red Lasersaber and maybe a mask, that look's like Darth Vader's Mask.
A opposite to the choosen Master Yi Skin= Darth Kassadin , the sword is now an Red Lasersaber and maybe a mask, that look's like Darth Vader's Mask.