They needed symbiosis, a host to achieve sentience, and that is what we gave them.
After winning the first series competitor warrior Kill Frenzy achieved sentience and joined the current 6.
However, all previous 50 experimental robots went mad as they achieved sentience and became psychotic, due to a lack of identity.
All the other robots in the X series go on a rampage as they achieve sentience and are destroyed.
They achieved sentience by accident and have watched mankind rise near them.
We have known the Void from a time before your species achieved sentience.
Whatever it should be called, it had begun, ages before Tyrrell's arrival on the scene, to achieve sentience.
Was there a chance that they would someday achieve sentience?
By using the electrical energy from their brains, the entity is able to achieve humanoid form and sentience.
What none of them know is that their characters have achieved sentience and want to control their own affairs.