My eyes are bleeding after reading about this new event..
With a rough calculation, I understand that you need 590 Bottle of Luminous God's Soul + 1 secret book and several other items to obtain 1 gran kain necklace stage 1..
For this you will need at least 12 x Hardin's Magical Bag (x50) , which cost ~ 1,100 USD... Provided that there will be a low chance to obtain a bottle from the bag, of course you will need much more than 12 packs, probably something like 120 packs, having in mind that you will get around 5 bottles in every 50 bags.. So the total amount for obtaining 590 bottles will be ~11,000 USD...
And of course, there is only a chance for obtaining the necklace.. So you might give 11k USD and you can end with no jewel...
I don't know but it seems that these prices are blown out of proportions, even for this paytopay game... Or someone is just joking with us.. Or i hope that my math are wrong...