CralexNS, an old developer from DA:UT99, has made his own version of the survival mode for Defence Alliance 2. He made some drastic changes, and it's definatly very cool!
First of all he made a new HUD, which shows the dynamic difficulty, how many specimens have been killed and the amount of specimens alive.
You might also notice the percentage next to the amount of specimens, which indicates how many specimens out of 100% are in the game. When the threshold goes below 25%, the specimens get reinforcements, and the Patriarch will be spawned. You will then see the health bar of the Patriarch in the HUD.
During the rounds champions will be spawned, they are stronger version of the regular zeds.
Also another big change are the lives, which are no longer individual, but for the whole team.
And finally the spawned specimens are changed, for instance you will see alot more crawlers and less husks.
This mutator is still under construction, but you can play the preview on "Furious-Gaming.com DA2: server #4", at 18.104.22.168:8007