As much as Leon wanted, he couldn't just rely on the skeletons alone. So, he asked Pedro to reunite all the people who couldn't fight but had some mana. Noticing that they had no place to run, no-one refused Leon's idea. Even kids and the elderly end becoming part of the plan. Leon took out the railgun and put some steel platform he created above the first line of defense.
"This is a railgun. Fortunately, this weapon doesn't need projectiles per se." Leon explained. "But it needs fuel. Your job is to recharge this as much as possible with your mana; please be quick; once you pour your mana, go to the end of the queue and repeated that as many times as you can. It would be a good idea to let an archer with a good aim to use it and kill those Tyrannosaurus Rex."
"I think I'm the best archer in the city..." Pedro said." You can leave that to me. But you look like you are a powerful mage, wouldn't it be better if you use that yourself?"