A few years ago, I played on a server where you had to fight multiple waves of enemies (antlions, zombies, etc) to defend a certain thing (I think it was called a nexus or something like that). There were multiple classes, each with their own weapons (and abilities?), and you could put downa finite amount of barricades before the game started as well.
You earned money after every game which could be spent on RPG-like items (eg a helmet which gave +3% to a stat). The shop / lobby was a tiny island with a house / pub during night time, and to join a game you could just hop on one of the boats.
What was the gamemode called, and are there still servers having it?