Ошибка генератора случайных предметов

Итак, в общем, я делаю генератор случайных предметов для классного проекта. Прямо сейчас часть генерации имени не работает, когда она находит 3 или более имен. Ошибка, которую я получаю:

FormatExeption is Unhandled Произошло необработанное исключение типа «System.FormatException» в mscorlib.dll.

Дополнительная информация: индекс (отсчитываемый от нуля) должен быть больше или равен нулю и меньше размера списка аргументов.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication4
{
    class Program
    {
    public static string ID { get; set; }
    public static int Damage { get; set; }
    public static int Defense { get; set; }
    public static string Name;
    public static string Rarity;
    public static int NumberOfNames;
    public static string ItemType;
    public static Random Random = new Random();
    public static List<string> ItemTypeList = new List<string> { "Chest area armor", "Weapon", "Shield", "Head area armor", "Leggings", "Shoes", "Gloves", "Belt", "Ring" };
    public static List<string> WeaponList = new List<string> { "Staff", "Sword", "Dagger", "Wand", "Axe", "Mace" };
    public static List<string> Value1 = new List<string> { "Wooden", "Bronze" };
    public static List<string> Value2 = new List<string> { "Silver", "Steel" };
    public static List<string> Value3 = new List<string> { "Dragon Glass", "Adamantium", "Titanium", "Arcane", };
    public static List<string> ArmorValue = new List<string> { "Cloth", "Leather", "Iron", "Silver", "Steel", "Titanium", "Arcane", "Dragon Glass", "Titanium" };
    public static List<string> Name1 = new List<string> { "Stupid", "Great", "Powerful", "Epic", "Masterfull", "Mighty", "Bountiful", "Foreverlasting", "Pointless", "Useless" };
    public static List<string> Name2 = new List<string> { "Things", "Power", "Proportions", "Torment", "Legs", "Turnament", "Shit", "Crazyness", "Awesomeness" };
    public static List<string> NameLenght3List = new List<string> { "Ragnarok", "Power", "Bondage", "Noobs", "Great Weakness", "Error", "404", "Torture", "SHIT STATS(No idea since I'm not good enough to programm stats based on names)", "The Dark Lord", "Emperor", "Monkey Kong", "I ran out of words", "Blablabla" };

    public static string ItemGenerator(int droprarity)
    {
        int dropRarity = droprarity;
        NumberOfNames = NumberOfNamesGenerator(dropRarity);
        Console.WriteLine(NumberOfNames);
        Rarity = RarityGenerator(dropRarity);
        ItemType = ItemTypeGenerator();
        if (ItemType == "Sword")
        {
            ItemType = WeaponList[Random.Next(0, WeaponList.Count)];
        }
        Name = NameGenerator();
        return Name;

    }
    public static string RarityGenerator(int dropRarity)
    {
        switch (dropRarity)
        {
            case 1:
                Rarity = "Poor";
                break;
            case 2:
                Rarity = "Common";
                break;
            case 3:
                Rarity = "Uncommon";
                break;
            case 4:
                Rarity = "Elite";
                break;
            case 5:
                Rarity = "Rare";
                break;
            case 6:
                Rarity = "Legendary";
                break;
        }

        return Rarity;
    }
    public static string ItemTypeGenerator()
    {
        return string.Format("{0}", ItemTypeList[Random.Next(0, ItemTypeList.Count)]);
    }
    public static int NumberOfNamesGenerator(int dropRarity)
    {
        switch (dropRarity)
        {
            case 1:
                NumberOfNames = 2;
                break;
            case 2:
                NumberOfNames = Random.Next(2, 4);
                break;
            case 3:
                NumberOfNames = Random.Next(2, 4);
                break;
            case 4:
                NumberOfNames = Random.Next(2, 5);
                break;
            case 5:
                NumberOfNames = Random.Next(2, 5);
                break;
            case 6:
                NumberOfNames = Random.Next(2, 6);
                break;
        }
        return NumberOfNames;
    }
    public static string NameGenerator()
    {
        int nameNR = NumberOfNames;
        if (nameNR == 2)
        {
            return string.Format("{0} {1}", Rarity, ItemType);
        }
        else if (nameNR == 3)
        {
            return string.Format("{0} {1} of {3}", Rarity, ItemType, NameLenght3List[Random.Next(0, NameLenght3List.Count)]);
        }
        else if (nameNR == 4)
        {
            return string.Format("{0} {1} of {3} {4}", Rarity, ItemType, Name1[Random.Next(0, Name1.Count)], Name2[Random.Next(0, Name2.Count)]);
        }
        else if (nameNR == 5)
        {
            return string.Format("{0} {1} of {3} {4} {5}", Rarity, ItemType, Name1[Random.Next(0, Name1.Count)], Name1[Random.Next(0, Name1.Count)], Name2[Random.Next(0, Name2.Count)]);
        }
        else if (nameNR == 6)
        {
            return string.Format("{0} {1} of {3} {4} {5} {6}", Rarity, ItemType, Name1[Random.Next(0, Name1.Count)], Name1[Random.Next(0, Name1.Count)], Name1[Random.Next(0, Name1.Count)], Name2[Random.Next(0, Name2.Count)]);
        }
        else
        {
            string ErrorSword = "Error Sword/Armor/blablabla";
            return ErrorSword;
        }
    }
    static void Main(string[] args)
    {
        int number;
        number = Random.Next(1, 6);
        Name = ItemGenerator(number);
        Console.WriteLine(Name);
        Console.ReadLine();;
    }
    }
}

Ошибка возникает при общедоступной статической строке NameGenerator()