The Killionaire medal is represented as a black hexagon with 10 platinum/silver stars. It is awarded for getting a 10th kill within 4 seconds of your 9th. Unlike Halo 2's "Killimanjaro" medal, this does not repeat if you kill 10+ opponents within four seconds of the previous kill. This is the hardest multi-kill medal to achieve, as there are no multi-kill medals beyond this point. Also, it should be noted that you will most likely get the Killing Frenzy medal after earning this. The maximum time for getting this medal is 36 seconds, as you have a maximum of four seconds between each kill. In Halo 4 it is 40.5 seconds and 4.5 seconds, respectively.