public interface INode
 {
     string Name { get; set; }
     string Id { get; set; }
 }

 public interface IStat : INode
 {
     bool IsPrimaryStat { get; set; }
     int Value { get; set; }
 }

 public interface IPlayer : INode
 {
     IEnumerable<IStat> Stats { get; set; }
     int Speed { get; }
     int HP { get; }
     IEnumerable<IWeapon> Inventory { get; set; }
     IWeapon Weapon { get; set; }
     void Attack(IPlayer enemy);
     void ReduceHealth(int damage);
 }

 public interface IEnemy : IPlayer
 {
 }

 public interface IWeapon : INode
 {
     int Damage { get; set; }
     int Price { get; set; }
     int SortOrder { get; set; }

     int CalculateDamage(IPlayer player);
 }

 public interface ITwoHander : IWeapon
 {
 }

 public interface IStaff : ITwoHander
 {
 }

 public interface IDagger : IWeapon
 {
 }