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3) Force Field. If that's not a good investment, Mana Fuel Factory. Also, what does Weapon Kit do?

Force Field gives a friendly unit resistance to elemental damage. Mana Fuel Factory makes our machinery cost less gold. Weapon Kit is a combat spell that temporarily gives an Infantry or Pikeman unit three abilities - Throw Net, which immobilizes an enemy if it fails to resist, Sabotage, which can deals damage to a wall, gate, or machine unit in melee range, and Fire Blunderbus, which deals a small amount of damage in an area in front of the unit. It's not super useful for us because we don't have very many infantry.