Talk:Colossus/@comment-217.168.185.47-20130316232906/@comment-71.238.193.76-20130324101940

The challenger (and the mega/behemoth in the same line), unsurprisingly, is for tanking (see what I did there?) damage. Pull up in front of an unknown bunker in case of snipers, then after it starts getting a few hits you move your hellfires (or razors if you haven't gotten hellfires yet) in to do the real damage.

Colossus is for baiting. Moving just within range of a mortar (or RBT if you have the room to do it effectively) and causing it to waste its fire while you (again) move your HF/razors in to take it down. Some people prefer dogs for this purpose, but dogs don't leave as much room for error as the colossus. Dogs also are very difficult to use against RBTs; most of the time the splash will still at least wound them, meaning you have a limited amount of time to work. The colossus is designed to shrug this damage off.

They fill different roles, bro.