It is better to train them at the start of the level.
You must train 3 Rocs and send them to Kastor's base. On the level where the Promeatheus Titan comes, after you have defended your base for the time limit, the Titan will attack you. Kronos cannot be defeated by anyone except Gia. On the last level when you have all of the four summoning trees, do not attack the enemies base or Kronos will come from the Tartauras gate and destroy your empire. On the level where you have to kill Cerebus, in order to protect the Son Of Osiris train at least 30 Priests to defend him. Also, the Invoked god power is not visible until the game is resumed. Note: Once the game is resumed, more Plenty Vaults cannot be put at the same location again. Many Gaia Forests can be put around a Titan once the game is paused to stop him from moving for the entire scenario, which gives you the freedom to attack whenever one is completely ready. Many Gold Mines can be placed like a linked barrier to stop enemies. Many Plenty Vaults at the same location will give an enormous gain of space, and give the same amount of resources. Then, all the Plenty Vaults or Gold Mines can be put one over the other. Once the ' DIVINE INTERVENTION' code is enabled to get multiple Plenty Vaults or Dwarven Gold Mines, you can use to pause game play.