Talk:Kha'Zix/@comment-3013755-20120922211453/@comment-169.229.103.139-20120923025518

You can evolve your 4th if you kill Rengar before he kills you(seriously, check the forums). The tradoff is that, if Rengar kills you first, his Bloodtooth Necklace cannot lose stacks. It's a "hidden passive" that's too gamechanging for me to agree with D: