It costs 350 gold 0 mana, it does 50 damage but is slow has 200 hp (low) its a heavy, order, ranged unit
It is a spell that makes units train faster (1.25) spells recharge quicker (2x) and make the time between upgrades faster (1.50x).
Each level upgrade ads the quicker working stuff at each level unit then spell then upgrade. It costs Level 1, 250 g and 50 mana, Level 2, 350 g and 75 mana, Level 3 450 g 100 mana.