My last whisper will be

..... Deadly...

Riot Games Pentakill released some heavy metal songs, and I really like the "Last Whisper" !
But I also knew, that Twitch's visual upgrade had some new quotes..And not just "some" quotes, but a whole bunch of them! including him interacting with the item Last Whisper, when he buys it. He'll say things like " My last whisper will be..." and then random things like: street bacon, maggot pie, curdle pops  And of course what he says in the picture!
In the song they sing: 

They'll hear my deadly last whisper,
right before they die.

Which just fits Twitch's quote, since... He'll die after he said it?

Twitch and Pentakill are copyrighted to Riot games!