Sylatin was Kruun's assistant; he received the coordinates of the S.W.O.R.D. spaceship from Ord.
He was ordered by Kruun to interrogate and break the captured soldiers who were just landed on the planet.
He spoke in private to a soldier, who offered him a deal to seize the throne if only Sylatin would persuade Kruun not to use the weapon against Earth.
Sylatin reported back to Kruun, who suggested him to go along with it, as soon as Agent Brand will bring Colossus to them.