I know this has been suggested a lot, but I have a pretty good idea for PvE (imo). So basically how it works is that you are in a map with no high ground. It's like the desert map, but with no sandpits. Every wave goes by rounds and gets more intense. For example, round 1 could be a bunch of goblins, like 10. Then, round 2 could be, 15 goblins. Round 5 could be 30 goblins and a yeti. There could be shadows, ogres, yetis, and goblins. After finishing a round, there should be a 30 second break for players to gather items. Once someone dies, they don't respawn. Once everyone is dead, the game ends. This gamemode would be a cooperative survival with a minimum of 5 players. The players cannot hurt each other.
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