Hello.

My suggestion is to add a new bundle in to the game and that being the "Pentakill Bundle" where you could get all 5 champions as well as the "Pentakill skins" for them in one bundle.

If bought separately, the price can jump up to 7500 RP and that's quite a lot, so maybe change the price to a good 3500 RP when bought in a bundle.

Here's a little image I created to go with my suggestion:
http://i.imgur.com/ZU2JxjI.jpg - also available as an attachment.

What do you think?

Attached Thumbnails

 

Still think it should have been pentakill draven