How and where can I tell the game that zombies are hostile against everything? pls let me know (minecraft vanilla 1.13 on server)

I will join them in teams and wanna let em go against each other without using a mod like mob arena. There must be an easy way ore?

cheers - das boot

closed as too broad by arghtype, Wondercricket, Broots Waymb, Malco, Virusbomb Feb 11 at 15:31

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