6dc5455c____The_Coppermind___17th_Shard__Entry
[Chapter] 67 [Entry] 
Koloss also had little chance of breaking free. Four spikes, and their diminished mental capacity, left them fairly easy to dominate. Only in the throes of a blood frenzy did they have any form of autonomy. Four spikes also made them easier for Allomancers to control. In our time, it required a duralumin Push to take control of a kandra. Koloss, however, could be taken by a determined regular Push, particularly when they were frenzied.
The Hero of Ages/Epigraphs - The Coppermind - 17th Shard
Entry