The Colossus features 2 thinner sidewalls with an increased separation and four segments, connecting them to the circular body.
The Colossus shoots a Destroyer Bullet that can 2-shot an Alpha Pentagon. However its speed is the same as a Basic bullet and it takes half a minute to reload(even worse than a snail's pace). From the Railgun, it loses 2 segments and its sidewalls get distanced. From the destroyer, it turns its barrel into a wider and shorter Railgun.
- Its' name is a reference to the game Stellaris.