Blood Moon

I'd say that if it was legitimately considered as an option by Riot, it wouldn't be implemented anytime soon because it would require a large enough audience and fanbase to support the required resources, hence the problems with smaller queues not being played in the past and being removed.

It's also a very new queue type, which is bound to have a lot of hidden problems and inconsistencies that would be abused left and right when people dedicate time to practice it.

I'd say it already happens,in the "All-Star Event".

It's named "assassin mode",so yeah,i think it's that.