I can't remember what its called but here is some details about the minigame: ok so you get points everytime you kill a mob then with these points you can get a upgrade for your armor or weapon, you can get potions too. There are a lot people on that minigame i think that there are classes too if i remember right. And the minecraft youtubers did a video about it, sadly i can't find it. The goal of the minigame is just to kill every mob you so. So please help me xD
Added (1). I forgot to say that the point system is very similar to the minigame i think its called VampireZ on the hypixel server