The basic idea was that there was an undead prison sending prisoners to sacrifice for something, and you had to build towers along the road to stop the prisoners from reaching the liches. It has a bunch of races (like the naga/blood elves) and there was an enemy that looked like a fel orc raider called Speedhack ftw!. I don't remember what the map was called and I want to download it again. I've been trying to find it for a really long time and now i'm mad because I couldn't