I suggest a town which allows 1-20 players called "Ultimate battle" or whatever

#This town would have a all-powerful boss "AGENT" which consists of mass-damage and defense..
#Spawns every 10-30mins, this boss could drop cool new items, Ex. "Nuclear-Matter Robe", "Nuclear blaster", "Dark matter robe". The items should have good stats, dropping on 1 PERSON ONLY PER KILL, UN TRADABLE!
#There should be a alarm on when it respawns