This should be final update for now, unless someone has an idea for a Challenge.
New Challenge Mode ideas:
Seek and Destroy: You get infinite quad but u need to get a kill every 5 secs. If you don't, you lose the quad and lose the challenge. (20 kills = win). The infinite quad replenishes itself after every kill, but if u go 5 secs without a kill, you the lose the quad.
Life-stealer: 15% of the damage you deal is dealt back to you as health. But same goes for your opponent, making killing your opponent really difficult. So u need to be sneaky to kill him, don't receive any damage or he will keep healing himself. (10 kills = win)
Both would require modding the actual sourcecode, not doable in cubescript.
Although, since quad lasts 20 seconds, can do this:
Seek and Destroy: (pretty much just Rampage mode): get x amount of kills every 20 seconds to replenish quad. Every time the quad replenishes, the amount of kills you need, goes up by 2. (1st quad 3 kills, 2nd quad 5 kills, 3rd quad 7 kills, etc)
Life-stealer: I could do something like, all vs you, but you get health every 100 damage you do. Not sure. I wanted to do something with Vampire-Mode like on HellFire boss, but couldn't figure anything out.
Doing anything where a bot spawns with quad+hb would require a custom map.
Both nice ideas, I'll see what I can do sometime soon. Waiting to see if some more challenge suggestions pop up.