Allomantic control of koloss

The secret the Lord Ruler built into the koloss as their weakness — the twin of the kandra weakness. A duralumin-flared Soothing (or Rioting) breaks past their minds; the Allomancer then feels herself inside them as if they were an extension of her own body and can direct them individually or as a host. TenSoon's aside that the koloss were his *cousins* and the way Vin had taken him over the same way are what point her at the trick. MB1:WoA:Ch 54