back in alpha the colossus had a really cool looking attack where it slowly tracked single units with both of its beams, dealing continuous damage but in a very small area.
the colossus could get the same high explosive/ high impact switch mechanic of the thor but for its attack pattern
I am very upset that they didn’t make a zerg gameplay trailer 
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Looks like focus fire mode
This look sick tbh, maybe can be put in the mothership basic attack also
Looks cool, but it also looks like it has clear drawbacks: the colossus is immobile and it doesn’t look like the attack can be cancelled. That could be changed, but then it’s almost like a void ray.