The Scrin Conyard generates a basic income for the player. It also spawns Tiberium around it. Most Scrin buildings have to be placed on Tiberium fields. Scrin theirself have no harvesters or refineries, they instead place control towers on Tiberium Trees or crystalls which then boost the income and as a bonus increase the groth rate of the occupied trees. That area can then be used to place new buildings and to expand.