// Returns index 0~7 for equip level 70-
// Returns index 8~15 for equip level 70+
private static int Roll(int itemId)
{
int itemLevelFactor = ItemMetadataStorage.GetOptionLevelFactor(itemId);
Random random = RandomProvider.Get();
if (itemLevelFactor >= 70)
{
return(random.NextDouble() switch
{