This would be a game mode with only one daily run, rewarding the so much needed runicite.
Player will be able to choose only heroes marked as 'undead' (this trait would need to be created).
Those undead heroes would be any vampire, zombie, skeleton, spirit... (So, we have already more than the 5 minimum to run it).
In this game mode we would not be able to change our heroes, wich are attacking other non-undead enemy heroes, with an endless number of waves.
Once our five heroes died, the amount of runicite given would be based on how many waves have we defeated.
This could also have it's quest (defeat one wave on 'Undead invaders' game mode).
Could this be a good idea? It will give some new contest (long time asked by players) and a good source of runicite.
This would also make players use some unused heroes like zombie squire, or the little cute banshee