public void FireBall(Human target)
{
if (target == null)
{
throw new ArgumentNullException("target", "Fireball target cannot be null");
}
Random rand = new Random();
int damage = rand.Next(20, 50);
Console.WriteLine(Name + " hurls a Fireball at " + target + " for " + damage + " damage");
target.SetHealth(GetHealth() - damage);
target.isDead();
}