Both the Army Style and the Summoning Style relied on numbers. The summoning class used mana, so it did not cost a lot of money. Even if the summoned creatures were destroyed, they could still be summoned the next time. However, it took a lot of time to summon those creatures during battle.
As for the Army Style, it required a lot of money. The army would be built before the battle and could all be used immediately. Once destroyed, money would be needed to rebuild them. The good thing was that the time to get the army ready was very short.
The rebuilt mechanical army used psionic energy as the main energy source. Most machines were modified to be psionic powered. The electromagnetic cannons had all been swapped out for psionic cannons that were many times stronger. Even the mechanical soldiers were equipped with psionic shields and small-caliber psionic lasers among other things.
