The Colossus hero is a mostly late game hero do to its expensive cost. its range when upgraded with thermal lance is a mighty tool in its arsanal along with its ability to see and walk up high ground. due to its large size, long range, and sight the Colossus is a easy to kill hero if caught off guard.
it is best when using the colossus to keep it near high ground for a quick escape, and is effective when used in combination with a defensive support tower so it may be recalled to the base if ambushed and healed to full.
the colossus is HIGHLY effective to low health light units ( marines, zerglings , zealots ) due to its very high damage and large splash
be aware of viking mercs , or corruptors from the unit shop who may snipe out your colossus.
the colossus also make a great choice for hero focused play