Skulk:Many players said,skulk was not useful in Combat Mode,because it always die on the way to kill .But i can say,Skulk is most useful in the combat mode,why?it's because when it upgrade the skill,it was killer machine(haha

my english is not very well sorry,i am hong knog person so is cheap for english).I wil tell my skulk how to upgrade.
Level 1:Do not go to marine's base , because you didn't have any skill .Wait in the road and wait the marine come to your waiting road
or you can go marine with your teamates