Braineater plan change.
Having acted against Earth wishes in trying to get rid of his enemy, Gaborn isn't as superpowerful as before, but still will try and get rid of the Reavers.
A kid gives him surprising new information gained from eating the brain of a dead 'un. Yum.
So, a underground Reaver bash, is what comes next, to try and remove the menace before their super-wizard runs amok with an army.