That challenge sounds almost impossible, especially if you’re winning most of the matches.
Any tips on how to get this one?
It’s not possible outside of full party boosting. I’ve been playing for the past few hours and the most I keep getting is 9 maybe 10, but then again it’s hard to get if you’re always the King 
Yeah the most i’ve had was 9, and that was when I was joined mid game… Seems like the best way to get this challenge. Go AFK for like 4 minutes, then go at it
seriously I think that someone (huhuuh 343) smokes too much or something like this XD
i woke up this morning to my friend telling me about this challenge and him saying he got it when i went to ply it said i’m temporarily banned i was like wtf whats this for then he tells me that he turned on my controller and signed in more accounts so that he could boost it. so if it is a challenge to punish boosters then why did i get banned and not him?
We need an answer now. 343, step your game up, 18 regicides in 1 match is impossibru.