public void Heal(Character target)
 {
     this.Mana -= 100;
     target.Health += 150;
 }
 public abstract void Attack(Character target);
 public override void Attack(Character target)
 {
     target.Health -= this.Damage;
     this.Health +=this.Damage/10;
 }
 public override void Attack(Character target)
 {
     this.Mana -= 100;
     target.Health -= 2*this.Damage;
 }