u/MefistoDX

1- Something similar to TF2 in man versus machine where you have to survive in an area while hordes of enemies try to kill you.

2- Something similar to the Aghanim's Labyrinth event in Dota 2, considered by the community to be the best PvE mode in Dota, a roguelike dungeon crawler.

3- Or something similar to Left 4 Dead where you need to cross an area full of enemies to the next safe zone?